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observed starspots are in general much larger than those on the Sun: up to about 30% of the stellar surface may be covered, corresponding to starspots 100...

average are known as starspots. Small, dwarf stars such as the Sun generally have essentially featureless disks with only small starspots. Giant stars have...

Biggest Starspots (press release 990610)". University of Vienna. Archived from the original on 24 June 2010. Retrieved 20 February 2008. starspots vary on...

of the plasma, until it reaches the star's photosphere. This creates starspots on the surface, and the related phenomenon of coronal loops. A star's...

indirectly observed, and can behave like sunspots. We can refer to these as starspots, although clearly non-analogous features also may be present as well....

Bibcode:1989A&A...217..187P. Alekseev, I. Yu.; Kozlova, O. V. (2002). "Starspots and active regions on the emission red dwarf star LQ Hydrae". Astronomy...

variations can be modelled by only one or two large starspots, though not all cases are so simple. The starspots could be groups of smaller spots or single giant...

process, which leads to the formation of starspots on its surface. As V1400 Centauri rotates, its starspots come into and out of view, causing the star's...

that the simplest mechanism for the creation of the distortion wave was "starspots", which, in analogy to sunspots, are large, cool active regions on the...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

possibly due to changes in the starspots. Measurements of the long-term variability show two overlapping cycles of starspot activity (compared to the Sun's...

distinguished from rotation. If a star displays magnetic surface activity such as starspots, then these features can be tracked to estimate the rotation rate. However...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

that generate starspots. The spots are similar in distribution to those on the Sun, but HAT-P-11 is a more active star and has a starspot coverage approximately...

For mapping starspots it was first used by Steven Vogt and Donald Penrod in 1983, when they demonstrated that signatures of starspots were observable...

temperature in the 5,770–5,780 K (5,500–5,510 °C; 9,930–9,940 °F) range. Starspots, cool regions of disrupted magnetic field, lie in the photosphere. Above...

years old and displays moderate stellar activity, but whether it has starspots, which would tend to create false signals when a planet crosses them,...

naked eye. The star is exhibiting strong starspot activity, with 4.1±2.5% of its surface covered by starspots. The "Hot Jupiter" class planet Kepler-45b...

Later observations showed that the brightness variations are due to starspots. It was given its variable star designation in the year 2000. Periodic...

star that is much more active than the Sun with starspots covering roughly 6% of its surface. Starspots are long-lived, with at least one persisting for...

from their brightness variations. This can be used to effectively image starspots or asteroid surface albedos. Microlensing is a process where relatively...

a transit can provide insights into the planet's atmosphere. However, starspots and other features on the star can also affect the measured spectrum and...

magnetic field of these stars is believed to produce starspots of enormous extent. Due to these starspots the brightness of α2 Canum Venaticorum stars varies...

heavy elements. The star is exhibiting strong starspot activity, with relatively cold (4700±300 K) starspots concentrated in two mid-latitude bands similar...

similar to solar abundance. The star features a numerous and long-lived starspots, and belongs to a peculiar variety of inflated K-dwarfs with strong magnetic...

classification of M4.0V. The chromosphere of this star is weakly active, causing starspots that vary the stellar luminosity as it rotates. It has 29% of the mass...

Sturmann, L. (2016). "No Sun-like dynamo on the active star ζ Andromedae from starspot asymmetry". Nature. 533 (7602): 217–220. arXiv:1709.10107. Bibcode:2016Natur...

researchers found that intrinsic variability, stellar activity or even starspots were not convincing explanations for the variations, leaving the orbital...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

filtered out other sources of radial-velocity variance, including effects of starspots, photospheric granulation and rotation, as well as interference from the...

capture images showing the starspots on Zeta Andromedae, a star 181 light-years away. This was the first time that images of starspots on stars other than the...

about 80% of the size and mass of the Sun and it is a little cooler. Starspots in the WASP-6 system helped to refine the measurements of the mass and...

Bibcode:1989A&A...217..187P. Alekseev, I. Yu.; Kozlova, O. V. (2002). "Starspots and active regions on the emission red dwarf star LQ Hydrae". Astronomy...

primary's observed fast rotation and strong hydrogen-alpha emission; large starspots on the primary, though this was found to be unsupported by evidence; and...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

variable. This is a class of variable star whose variability comes from starspots on the stars' surfaces. HR 7578 also has a common proper motion companion...

stellar flares which could double a star's brightness in minutes and huge starspots which can cover 20% of the star's surface area, have the potential to...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

2012. Roberto Sanchis-Ojeda; Josh N. Winn; Daniel C. Fabrycky (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

the constellation of Octans. It is a BY Draconis variable, with large starspots causing it to change brightness as it rotates every 13 hours. TYC 9486-927-1...

BY Draconis variables are cool dwarf stars which vary as they rotate due to starspots or other variations in their photospheres. The two red dwarfs of Castor C...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

variations in their luminosity due to rotation of the star coupled with starspots, and other chromospheric activity. Resultant brightness fluctuations are...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

elements at 170% of Sun metallicity, young and has a very prominent starspot activity. Starspots are covering about 40% of star surface at transit latitudes,...

active starspots. The primary (II Pegasi A) is a cool subgiant, an orange K-type star. It has begun to evolve off the main sequence and expand. Starspots cover...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

fields of close-in exoplanets may cause increased stellar flares and starspots on their host stars, in 2019 this claim was demonstrated to be false in...

a BY Draconis variable, exhibiting brightness variations due to large starspots and rapid rotation. EK Draconis is a yellow dwarf star with a spectral...

them could be either a rapidly rotating star with unevenly distributed starspots, or a spectroscopic binary with a 1.082-day period. Weber & Strassmeier...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zones where it plays an important role in the formation of sunspots and starspots. It was first proposed by Eugene Parker in 1955. For a magnetic flux tube...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

YZ Ceti also shows small periodic variations in brightness caused by starspots or chromospheric features moving as the star rotates. This class of variable...

eclipsing RS Canum Venaticorum variable whose primary star shows active starspot activity. One of the most peculiar systems in Lyra is MV Lyrae, a nova-like...

star which whose brightness varies across its rotation, having multiple starspots that contribute to the brightness variation. Its apparent magnitude varies...

rules out significant contributions from dust absorption. Instead, large starspots appear to be the cause for the dimming. Followup studies, reported on...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv:0911...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

surface temperature, suggesting the presence of starspots. Doppler imaging confirmed these starspots are associated with the K subgiant. (It was the first...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

violent than their more stable, larger cousins. Often they are covered in starspots that can dim their emitted light by up to 40% for months at a time, while...

; Connelley, M. S.; Reipurth, B.; Duchêne, G. (2022). "The Effects of Starspots on Spectroscopic Mass Estimates of Low-mass Young Stars". The Astrophysical...

information about this star. Resolved images also allowed observation of starspots (the analogue to sunspots), on this star, and their asymmetric distribution...

(1999). "Doppler imaging of stellar surface structure. XI. The super starspots on the K0 giant HD 12545: Larger than the entire Sun". Astronomy and Astrophysics...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

reported for Vega, compared to about 1 G for the Sun. In 2015, bright starspots were detected on the star's surface—the first such detection for a normal...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

classical T Tauri star and a T Tauri star showing periodic variability due to starspots. The Hipparcos data for the star shows periodic variability. S. A. Artemenko...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

Olah, K.; Sandmann, W. H. (1992). "Longterm behaviour of starspots. II - A decade of new starspot photometry of BY Draconis and EV Lacertae". Astronomy and...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

ISSN 2041-8205. Mallonn, M.; et al. (2018). "GJ 1214: Rotation period, starspots, and uncertainty on the optical slope of the transmission spectrum". Astronomy...

(eccentricity 0.0) with a period of 53.57 days. The star features prominent starspots, which are known to display the flip-flop effect; other stars that show...

(July 1999). "Doppler imaging of stellar surface structure. XI. The super starspots on the K0 giant HD 12545: larger than the entire Sun". Astronomy and Astrophysics...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

variability is attributed to starspots, making it an RS Canum Venaticorum variable. With Doppler imaging, the starspots were found to be lying at middle...

same system. In 2015, a spectroscopic study have revealed a very strong starspot activity of the HAT-P-13 star. As of 2009, HAT-P-13 has been confirmed...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

authors suggested rotational modulation due to surface activity such as starspots as a more likely explanation of the radial velocity variations. In previous...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

greater than that of Jupiter. Thus, this planet is an inflated hot Jupiter. Starspots on the host star WASP-6 helped to refine the measurements of the mass...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

orbiting both components of a wide binary system. HD 20781 has no noticeable starspot activity. In 2011, a pair of Neptune-mass gas giants were detected with...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

released in 1988 by Carl Howard (at - Audiofile Tapes) in the US, and the Starspot Compilation was made in 1989 for Bi-Joopiter in the UK. Label portrait...

catalog entry Mori, Mayuko; et al. (2024-04-05). "Characterization of starspots on a young M-dwarf K2-25: multi-band observations of stellar photometric...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

its age is estimated to be between 300 and 400 million years. Due to starspots, the star varies slightly over approximately the same period. The variations...

rotational periods of 20 Sun-like stars, measured by the effects of moving starspots on light curves, suggests that these approximately 4 billion-year old...

a means to find dark objects like brown dwarfs and black holes, study starspots, measure stellar rotation, and probe quasars including their accretion...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

shown that Epsilon Eridani varies as much as 0.050 in V magnitude due to starspots and other short-term magnetic activity. Photometry has also shown that...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

separation from the primary. The primary, BD+34 4217Aa, has a large number of starspots covering up to 18% of its surface. These are located in low latitudes...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

compared to the Sun. Around 4 to 6% of the star's surface is covered by starspots. Its EUV and X-ray fluxes are likely influencing the chemistry, dynamics...

This animation shows what happens as a sunspot (or starspot) forms and the magnetic field increases in strength. The light emerging from the spot starts...

and are very active and variable. There is evidence of large areas of starspot coverage, and they have intense and variable X-ray and radio emissions...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

magnitude varies between magnitude 8.93 and magnitude 9.03 as a result of starspots and varying chromospheric activity. The variability of Gliese 908 was...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

2011. Roberto Sanchis-Ojeda; Josh N. Winn; Daniel C. Fabrycky (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten...

magnitude varying between 11.64 and 11.70. The brightness changes are due to starspots and chromospheric activity combined with the rotation of the star. It...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

Berenices variable, a variable star that spins rapidly and has large starspots on its surface. It is currently in the Hertzsprung gap and its outer envelope...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

caused by an orbiting planet. Instead, the data was better modelled by starspots on TW Hydrae's surface passing in and out of view as the star rotates...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

Bibcode:1994A&A...282..867K Strassmeier, Klaus G. (September 2009), "Starspots", The Astronomy and Astrophysics Review, 17 (3): 251–308, Bibcode:2009A&ARv...

Star Observers. Retrieved 30 July 2015. Strassmeier, Klaus G. (2009). "Starspots". The Astronomy and Astrophysics Review. 17 (3): 251–308. Bibcode:2009A&ARv...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

caused by an orbiting planet. Instead, the data was better modelled by starspots on TW Hydrae's surface passing in and out of view as the star rotates...

Sanchis-Ojeda, Roberto; Winn, Josh N.; Fabrycky, Daniel C. (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten...

variable, where brightness variations are caused by the presence of large starspots on the surface and by chromospheric activity. Roman, Nancy G. (1987)....

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

variable, a class of binary stars with active chromospheres that cause huge starspots, but it is still only listed as a suspected variable in the General Catalogue...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters". Astronomy and Astrophysics. 508 (3): 1313–1330. arXiv:0911...

can also be detected in starspots or sunspots. The MgH spectrum can be used to study the magnetic field and nature of starspots. Some MgH spectral lines...

(May 7, 1987). "Allnighter:' Beach Bummer". The Washington Post. p. C08. "Starspot: Susanna Hoffs". Video Review. Vol. 8, no. 9. December 1987. p. 32. Hunt...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

spectra show line profile distortions, which were interpreted as starspots. These starspots were reconstructed and found to be concentrated at high latitudes...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

borealis" (1988, with Richard D. Lines and Thomas G. McFaul) "Evolution of starspots in the long-period RS CVN binary V1817 Cygni = HR 7428" (1990, with Richard...

Tregloan-Reed; John Southworth; C. Tappert (February 2013). "Transits and starspots in the WASP-19 planetary system". Monthly Notices of the Royal Astronomical...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

time-series photometry of the planetary transit of HD189733: no moon, no rings, starspots". Astronomy and Astrophysics. 476 (3): 1347–1355. arXiv:0707.1940. Bibcode:2007A&A...

convective motion of plasma inside a star, responsible for phenomena such as starspots and coronal loops. Even when a dynamo no longer exists, a fossil magnetic...

existence of the planet. Instead, a rare type of stellar starspot activity with very large starspots is now suspected. Also, CVSO 30 is suspected to be a...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

with the Sun, it is undergoing differential rotation. Lower temperature starspots cover a significant fraction of the secondary's surface, causing light...

complex activity cycle that varies with a period of about 7.5±1.7 years. The starspot activity combined with rotation and chromospheric activity is a characteristic...

days appear to have been caused by changes in the distribution of its starspots. Its rotational axis may be slightly offset from that of its planets....

Sanchis-Ojeda, Roberto; Winn, Josh N.; Fabrycky, Daniel C. (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten...

addition it shows longterm variations in brightness which may be due to starspots and rotation, possibly classifying it as a BY Draconis variable. It was...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

announced their discovery that the star's brightness varies. The star has starspots which affect its luminosity by 1.5 percent in visible light. As a result...

Kepler-411A exhibits significant starspot activity, with starspots covering 1.7+0.3 −0.2% of the stellar surface. Darker starspots are concentrated around the...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

evolution of the Solar System List of solar cycles List of solar storms Starspot Stellar evolution Sun life cycle Sunlight Hathaway, David (23 March 2017)...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

dwarfs. The star has little variability in its brightness, no signs of starspots or stellar flares have been found during two months of observations. It...

star, causing it to become magnetically active and host unusually strong starspots. In Chinese, 奎宿 (Kuí Sù), meaning Legs (asterism), refers to an asterism...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

but it has a similar fraction of heavy elements. The star has prominent starspot activity, with 3% to 14% of the stellar surface covered by areas 575±150...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

composition. In 2019, MOST photometry was used to disprove claims of permanent starspots on the surface of HD 189733 A that were alleged to be caused by interactions...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

2012. Roberto Sanchis-Ojeda; Josh N. Winn; Daniel C. Fabrycky (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

heavy elements roughly 190% of solar abundance. The star has no noticeable starspot activity. The spectroscopic survey in 2015 have failed to find any stellar...

Retrieved November 12, 2012. Sanchis-Ojeda, Roberto; et al. (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

a starspot. His observation and explanation were correct, but he was ahead of his time. It would be many years before the existence of starspots was...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

TESS light curve showed stellar flares and rotational modulation due to starspots, likely on either the B or C component. Observations with Chandra showed...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

96008 was ruled out on the basis of its more regular period. Eclipses and starspots were soon ruled out as the cause of the Gamma Doradus' variability, and...

Sanchis-Ojeda, Roberto; Winn, Josh N.; Fabrycky, Daniel C. (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

binary stars, Be Stars, Oblate stars, rapidly rotating stars, those with starspots, and the imaging of stellar disks (the first in history) and flare stars...

classical T Tauri star, and a star showing periodic variability due to starspots. V4046 Sagittarii is surrounded by a massive protoplanetary disk. The...

spectrum. It is also classified as a BY Draconis variable, cool stars with starspots and chromospheric activity that vary in brightness as they rotate. The...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

volatile than their larger, more stable cousins. Often, they are covered in starspots that can dim their emitted light by up to 40% for months at a time. At...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

periodic variation in the star's brightness, noting only one possible starspot over 130 days. Stellar activity of this sort has created interest in using...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

simulations of the Algol binary stars; the first astronomer to discover starspots on the cool star in an Algol binary and the first astrophysicist to apply...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

with a period of 10.3 days, which they attribute to the rotation of a starspot. Intense study of large numbers of stars suggest that 6.7% of stars with...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

curves available for large numbers of stars to study the behavior of starspots and learn more about stellar magnetic activity, In 2022 he published a...

3847/1538-3881/aaa9b5, S2CID 125765376, 111. Strassmeier, Klaus G. (September 2009), "Starspots", The Astronomy and Astrophysics Review, 17 (3): 251–308, Bibcode:2009A&ARv...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

faint to be seen with the naked eye. Kepler-30 is exhibiting a strong starspot activity. Three planets of Kepler-30 were detected by the transit method...

variable with a period of 11.63 days, caused by varying brightness as starspots move across the stellar surface across its rotation period. While the...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters". Astronomy and Astrophysics. 508 (3): 1313–1330. Bibcode:2009A&A...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

Several reasons have thus been proposed: an asymmetric distribution of starspots, impacts of one-way gas streams between the components of the binary system...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

that the supposed binarity is an artifact resulting from the presence of starspots. It is about 24 million years old and is spinning rapidly with a projected...

Campbell, B.; Cayrel, R. (August 1, 1984), "Spectroscopic evidence for starspots in the G dwarf HD 1835", Astrophysical Journal Letters, 283: L17–L20,...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

Trianguli B. BX Trianguli also has strong magnetic activity, manifested as starspots on the primary's surface and Hα emission. This system is composed of two...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

2012. Roberto Sanchis-Ojeda; Josh N. Winn; Daniel C. Fabrycky (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten...

elements similar to solar abundance. A survey in 2015 detected very strong starspot activity on HAT-P-18. In 2010 a transiting hot Saturn-sized planet was...

active stars that show variability in their apparent magnitude due to starspots on their surfaces. Despite Sigma2 Corona Borealis's two stars being separated...

rotates rapidly (with a period of about 2 days) and is variable due to starspots. PMN J2033-0656 is an edge-on radio galaxy. Its position gives Abell 70...

magnitudes. This type of variability is thought to be caused by large starspots moving in and out of view as the star rotates. Gliese 876 emits X-rays...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv:0911...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

S2CID 16808434. Roberto Sanchis-Ojeda; Josh N. Winn; Daniel C. Fabrycky (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten...

Maunder and Dalton Minima. Global warming Modern Maximum Solar minimum Starspot Maunder minimum John E. Beckman & Terence J. Mahoney (1998). The Maunder...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

1088/0004-637X/802/1/62. S2CID 119090455. 62. Strassmeier, Klaus G. (September 2009). "Starspots". The Astronomy and Astrophysics Review. 17 (3): 251–308. Bibcode:2009A&ARv...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

Sun, it is also a BY Draconis variable. These are a class of stars with starspots prominent enough that the star changes brightness as it rotates. It is...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

Properties of Active G and K Stars: Exploring the Connection between Starspots and Chromospheric Activity". The Astronomical Journal. 158 (3): 16. arXiv:1907...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

is too faint to be seen with the naked eye. Kepler-43 has a very strong starspot activity. The Kepler spacecraft detected a transiting planet candidate...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

(33.5%). The light curve shows asymmetries and variations that indicate starspots on the surface of the stars. The reconstruction of the surface of the...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

rotates with a period of 7.50 ± 0.86 days, which is seen due to evolving starspots in the TESS light curve. The host star was observed with the Large Binocular...

rotates rapidly, generating a strong magnetic field that creates large starspots and powerful flares. Star spots have been reported at a variety of latitudes...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

star is a BY Draconis variable, which shows periodic variations due to starspots. In 2012 researchers found a debris disk with extreme infrared excess...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

7 days) for its advanced age of 4 billion years, and exhibits a strong starspot activity. The star may be in the process of being spun up by the giant...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

estimated age of 1.46±1.26 Gyr. Accordingly, the star displays large starspots, which are responsible for slight variations in its brightness, first...

about 53°, and shows evidence of very weak differential rotation. The starspots probably cause milimagnitude variations in the brightness of Phi Phoenicis...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

Schwab, Christian; Terrien, Ryan C.; Wright, Jason T. (2020), "Persistent Starspot Signals on M Dwarfs: Multiwavelength Doppler Observations with the Habitable-zone...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

Retrieved November 12, 2012. Sanchis-Ojeda, Roberto; et al. (2012). "Starspots and spin-orbit alignment for Kepler cool host stars". Astronomische Nachrichten...

stars. It has an active chromosphere that exhibits strong and persistent starspot activity. A flare event was captured in 2013 while the star was being observed...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv:0911...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

doi:10.1051/0004-6361:20011810. Strassmeier, Klaus G. (September 2009), "Starspots", The Astronomy and Astrophysics Review, 17 (3): 251–308, Bibcode:2009A&ARv...

spectrum of Gliese 514 shows emission lines, but the star itself has a low starspot activity. Multiplicity surveys did not detect any stellar companions as...

International Variable Star Index classifies the 1 Puppis as a star with starspots that cause the brightness to change as it rotates, and which varies in...

Red dwarf with low starspot activity in the Hydra constellation...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

been detected on this star, which is stronger than the field on the Sun. Starspots on the star's surface have been resolved with Doppler imaging. The secondary...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

other types of variation. Balona, L. A (1995). "Tests of the Pulsation and Starspot Models for the Periodic Be-Stars". Monthly Notices of the Royal Astronomical...

but it was unclear if this was from the planet's atmosphere or from starspots on its host star. JWST observations of the planet's secondary eclipse...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

binary stars, Be stars, oblate stars, rapidly rotating stars, those with starspots, and the imaging of stellar disks (the first in history) and flare stars...

Properties of Active G and K Stars: Exploring the Connection between Starspots and Chromospheric Activity". The Astronomical Journal. 158 (3): 16. arXiv:1907...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

Evans and his fellow researchers studied late-type stars showing large starspots, and those subject to flares. They also turned their attention to double...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

quasi-periodic variability that was interpreted as stellar rotation and starspots. The light curve also showed several flares. Based on Gaia DR2 data this...

Sun, with a metallicity Fe/H index of 0.36±0.03. The star has very low starspot activity. In 2014, four planets orbiting HD 141399 were discovered by the...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

No Evidence for a Cloud-free Primordial Atmosphere and Constraints on Starspot Contamination". The Astronomical Journal. 164 (2): 59. arXiv:2105.10487...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

brightness varies by 0.14 magnitudes with a period of 82.9 days due to starspots. The star is most likely rotating in synchronous manner with its orbital...

M.; et al. (August 2000), "MT Pegasi (= HD 217813) - A Young Sun with Starspots", Information Bulletin on Variable Stars, 4933: 1, Bibcode:2000IBVS.4933...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

K-type main-sequence star about 233 light-years away. The star has a strong starspot activity, and its equatorial plane is misaligned by 36+10 −12° with the...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Solar-like oscillations Radiation zone Photosphere Starspot Chromosphere Stellar corona Stellar wind Stellar-wind bubble Asteroseismology...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

simulations of the Algol binary stars; the first astronomer to discover starspots on the cool star in an Algol binary and the first astrophysicist to apply...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

Retrieved 28 October 2021. Strassmeier, Klaus G. (September 2009). "Starspots". The Astronomy and Astrophysics Review. 17 (3): 251–308. Bibcode:2009A&ARv...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

spectroscopic tomography, by Mercedes Richards. First to discover and image starspots on the cool star in an Algol-type binary system, by Mercedes Richards...

Science Institute. Retrieved 2016-08-02. Kawahara, Hajime; et al. (2013). "Starspots-Transit Depth Relation of the Evaporating Planet Candidate KIC 12557548b"...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

highly magnetically active star, with about 25% of its surface covered in starspots which are much more abundant on the hemisphere facing the white dwarf...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

has been on magnetic field induced activity on late-type stars such as Starspots and flares in the framework of the so-called solar-stellar connection...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

No Evidence for a Cloud-free Primordial Atmosphere and Constraints on Starspot Contamination". The Astronomical Journal. 164 (2): 59. arXiv:2105.10487...

and is much younger than the Sun at 2 billion years. The data regarding starspot activity of WASP-69 are inconclusive, but spot coverage of the photosphere...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

1989), "Analysis of the variations in the light curve of U Pegasi and starspot activity", Chinese Astronomy and Astrophysics, 13 (1): 97–104, Bibcode:1989ChA&A...

the surface have been detected using asteroseismology that appear to be starspots (the stellar equivalent to sunspots on the Sun). In 2008 it was discovered...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

1086/432539, S2CID 119357548. Strassmeier, Klaus G. (September 2009), "Starspots", The Astronomy and Astrophysics Review, 17 (3): 251–308, Bibcode:2009A&ARv...

eISSN 1432-0746. ISSN 0004-6361. Strassmeier, Klaus G. (2 May 2009). "Starspots". The Astronomy and Astrophysics Review. 17 (3): 251–308. Bibcode:2009A&ARv...

postscript (link) Balona, L. A. (December 1995), "Tests of the Pulsation and Starspot Models for the Periodic Be-Stars", Monthly Notices of the Royal Astronomical...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

stars appear fainter than other stars of the same mass, likely due to high starspot coverage. GJ 2069 A also has a third companion star at a separation of...

concentration of heavy elements compared to the Sun. The star has no detectable starspot activity. An imaging survey in 2015 found no detectable stellar companions...

close orbit. The star displays excess ultraviolet emission associated with starspot activity, and is suspected to be surrounded by a dust and debris disk....

Collier Cameron, A.; Hilditch, R. W. (May 1997), "Eclipse mapping of starspots on XY UMa in 1992 and 1995", Monthly Notices of the Royal Astronomical...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

the Barnard's Star. It is a long-term variable with the prominent 5-year starspot cycle comparable to that of Sun's. The discovery designation of GJ 1128...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv:0911...

1086/516603, S2CID 14758154. Xiang, Yue; et al. (2024), "Further Study of Starspot Activity and Measurement of Differential Rotation for SZ Piscium", The...

features in the spectrum. The star is magnetically active with a 10.1±1.4 yr starspot cycle. It appears about 3.6 billion years old and the light emission shows...

A.; Close, Laird M.; et al. (August 2009). "A Tentative Detection of a Starspot During Consecutive Transits of an Extrasolar Planet from the Ground: No...

planets were detected around LP 816-60 as of 2013. The star has a magnetic starspot cycle of 10.6±1.7 years, and weak magnetic fields in chromosphere averaging...

Sun and has expanded to 23.5 times the Sun's radius. Over 2003 to 2012 a starspot was periodically dimming its light. The star is radiating 209 times the...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

"HATS-2b: A transiting extrasolar planet orbiting a K-type star showing starspot activity", Astronomy & Astrophysics, 558: A55, arXiv:1304.2140, Bibcode:2013A&A...

concentration of heavy elements slightly higher than solar abundance, and low starspot activity. The survey in 2015 have failed to find any stellar companions...

depleted in heavy elements compared to the Sun, and has a close to average starspot activity. Despite its advanced age, the star is rotating rapidly, being...

are frequent starspots on its surface, especially near poles. While the normal surface temperature of the primary is 3000 K, the starspots themselves are...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

younger at an age of 2.289±0.077 billion years. The star exhibits strong starspot activity, with spots covering 3% of the stellar surface. Multiplicity surveys...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv:0911...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

older than the Sun at 11.3+1.5 −4.8 billion years. The star does exhibit starspot activity as is typical for its spectral class. Multiplicity surveys did...

180% of the solar abundance of iron. The star does not have noticeable starspot activity, an unexpected observation for a relatively young star. The age...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv:0911...

the thin disk of the Milky Way. The primary is an old star with small starspot activity and low x-ray flux. The "hot Saturn" class planet WASP-29b was...

Kozhevnikova, A. V.; Svechnikov, M. A.; Kozhevnikov, V. P. (October 2009). "V.P. Starspot and flare activity of the dwarf system CM Dra". Astrophysics. 52 (4): 512–522...

9-day signal to correspond to the stellar rotation and be caused by a starspot. This 25-day candidate planet would orbit CI Tauri at a distance of 0.17 AU...

ADS 11060A composed of G1 and K6 young main-sequence stars with strong starspot activity. A radio flare from the star V772 Her was detected in 2011. The...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv:0911...

of the photosphere. Asymmetry in the light curve may also be caused by starspots on one or both components, which would result in slightly results for...

no period can be identified. HD 283750 is covered by a large amount of starspots, filling up to 28% of the stellar surface at the maxima of the magnetic...

this system, and the alignment of this signal is consistent with a polar starspot. "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope...

billion for the Sun, so it is still relatively young for a star of its mass. Starspot activity has also been detected, which varies from year to year. A circumstellar...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

1088/0004-6256/150/3/88. S2CID 118505114. Strassmeier, Klaus G. (September 2009). "Starspots". The Astronomy and Astrophysics Review. 17 (3): 251–308. Bibcode:2009A&ARv...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv:0911...

"HATS-2b: A transiting extrasolar planet orbiting a K-type star showing starspot activity". Astronomy and Astrophysics. 558. A55. arXiv:1304.2140. Bibcode:2013A&A...

No Evidence for a Cloud-free Primordial Atmosphere and Constraints on Starspot Contamination". The Astronomical Journal. 164 (2): 59. arXiv:2105.10487...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

variations attributed to the second planet might instead be caused by a starspot. A 2021 review of planets around giant stars lists this second planet as...

like a brown dwarf. Both brown dwarfs are weakly variable, likely due to starspot activity. Hansen, O. L.; Veeder, G. L. (June 1977), "Flare Activity on...

zone Microturbulence Oscillations Radiation zone Atmosphere Photosphere Starspot Chromosphere Stellar corona Alfvén surface Stellar wind Bubble Bipolar...

Bibcode:2022arXiv220411059M. Lanza, A. F.; et al. (April 1998), "Long-term starspot evolution, activity cycle and orbital period variation of AR Lacertae"...

1086/190179. Balona, L. A. (December 1995), "Tests of the Pulsation and Starspot Models for the Periodic Be-Stars", Monthly Notices of the Royal Astronomical...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv:0911...

1134/S1063772917010085, S2CID 125853869. Strassmeier, Klaus G. (September 2009), "Starspots", The Astronomy and Astrophysics Review, 17 (3): 251–308, Bibcode:2009A&ARv...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv:0911...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters", Astronomy and Astrophysics, 508 (3): 1313–1330, arXiv:0911...

160% of solar, and is of similar age to Sun. The star has significant starspot activity. The "Hot Jupiter" class planet Qatar-1b was discovered by the...

of cool stars, ultimately producing micro-arcsecond resolution maps of starspot distributions and surface magnetic fields. With Dr R. D. Robinson he co-discovered...

photometric monitoring of pre-main sequence stars in Orion: Rotation periods and starspot parameters". Astronomy & Astrophysics. 508 (3): 1313–1330. arXiv:0911.0760...

S2CID 14412880. Vivekananda Rao, P.; Radhika, P. (2002), "Long-Term Study of the Starspot Activity on the Eclipsing Short-Period RS Canum Venaticorum Star UV Piscium"...

1134/S1063773712050015, S2CID 119257644. Strassmeier, Klaus G. (September 2009), "Starspots", The Astronomy and Astrophysics Review, 17 (3): 251–308, Bibcode:2009A&ARv...

1086/429408. S2CID 119526948. Balona, L. A. (1995). "Tests of the pulsation and starspot models for the periodic be stars". Monthly Notices of the Royal Astronomical...

1093/pasj/60.3.571. Kozhevnikova, A. V.; et al. (November 2007), "Long-term starspot activity of the eclipsing binaries BH Vir and WY Cnc", Astronomy Reports...

has low ultraviolet emission, therefore it is suspected to have a low starspot activity, although chromospheric activity was reported elsewhere. There...

S2CID 118398949. Balona, L. A. (December 1995). "Tests of the Pulsation and Starspot Models for the Periodic Be-Stars". Monthly Notices of the Royal Astronomical...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters". Astronomy and Astrophysics. 508 (3): 1313–1330. arXiv:0911...

photometric monitoring of pre-main sequence stars in Orion. Rotation periods and starspot parameters". Astronomy and Astrophysics. 508 (3): 1313–1330. arXiv:0911...

unknown origin, yet has no detectable ultraviolet emissions associated with starspot activity. The discrepancy may be due to large interstellar absorption of...

Star Observers. Retrieved 30 July 2015. Strassmeier, Klaus G. (2009). "Starspots". The Astronomy and Astrophysics Review. 17 (3): 251–308. Bibcode:2009A&ARv...

explained by the presence of an extensive low-temperature region – a cool starspot on the surface of the more massive primary star. According to the calculated...