en Rho Draconis

Rho Draconis
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Draco
Right ascension	20h 02m 49.07268s
Declination	+67° 52′ 24.8294″
Apparent magnitude (V)	4.52
Characteristics
Spectral type	K3 III
U−B color index	+1.54
B−V color index	+1.34
Astrometry
Radial velocity (Rv)	−9.80±0.43 km/s
Proper motion (μ)	RA: +16.44 mas/yr ; Dec.: +47.31 mas/yr
Parallax (π)	7.61 ± 0.17 mas
Distance	429 ± 10 ly ; (131 ± 3 pc)
Absolute magnitude (MV)	−0.97
Details
Radius	28 R☉
Luminosity	402 L☉
Surface gravity (log g)	1.90 cgs
Temperature	4370 K
Metallicity [Fe/H]	0.03 dex
Rotational velocity (v sin i)	10 km/s
Other designations
	ρ Dra, 67 Dra, BD+67° 1222, HD 190940, HIP 98702, HR 7685, SAO 18676
Database references
SIMBAD	data

Rho Draconis (ρ Draconis) is a solitary^[10] star in the northern circumpolar constellation of Draco. It is faintly visible to the naked eye with an apparent visual magnitude of 4.52.^[2] Based upon an annual parallax shift of 7.61 mas as measured from Earth,^[1] it is located around 429 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.027 due to interstellar dust.^[5]

With a stellar classification of K3 III,^[3] Rho Draconis is a normal giant star that is past the first dredge-up phase of its post-main sequence evolution.^[7] It has the peculiar spectrum of a CN star, showing abnormal line strengths for cyanogen and calcium.^[11] The star has expanded to around 28^[3] times the Sun's radius and it is radiating 402^[6] times the solar luminosity from its photosphere at an effective temperature of 4,370 K.^[7]

References

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
^ ^a ^b ^c ^d Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133 (4): 475–493, Bibcode:1966MNRAS.133..475A, doi:10.1093/mnras/133.4.475.
^ ^a ^b ^c ^d Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
^ Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.
^ ^a ^b Ryon, Jenna; et al. (August 2009), "Comparing the Ca ii H and K Emission Lines in Red Giant Stars", Publications of the Astronomical Society of the Pacific, 121 (882): 842, arXiv:0907.3346, Bibcode:2009PASP..121..842R, doi:10.1086/605456, S2CID 17821279.
^ ^a ^b McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
^ ^a ^b ^c ^d ^e Mishenina, T. V.; et al. (October 1995), "Chemical composition of five giants with positive CN-indices.", Astronomy and Astrophysics Supplement, 113: 333, Bibcode:1995A&AS..113..333M.
^ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B.
^ "rho Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-05-30.
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
^ Mishenina, T. V.; Tsymbal, V. V. (September 1997), "Li and CNO abundances in the atmospheres of nine peculiar giants", Astronomy Letters, 23 (5): 609–614, Bibcode:1997AstL...23..609M.

[vanLeeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.

[Argue1966-2] Argue, A. N. (1966), "UBV photometry of 550 F, G and K type stars", Monthly Notices of the Royal Astronomical Society, 133 (4): 475–493, Bibcode:1966MNRAS.133..475A, doi:10.1093/mnras/133.4.475.

[PasinettiFracassini2001-3] Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (3rd ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.

[Famaey2005-4] Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272, S2CID 17804304.

[Ryon2009-5] Ryon, Jenna; et al. (August 2009), "Comparing the Ca ii H and K Emission Lines in Red Giant Stars", Publications of the Astronomical Society of the Pacific, 121 (882): 842, arXiv:0907.3346, Bibcode:2009PASP..121..842R, doi:10.1086/605456, S2CID 17821279.

[mcdonald2012-6] McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–357, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.

[Mishenina1995-7] Mishenina, T. V.; et al. (October 1995), "Chemical composition of five giants with positive CN-indices.", Astronomy and Astrophysics Supplement, 113: 333, Bibcode:1995A&AS..113..333M.

[Bernacca1970-8] Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B.

[SIMBAD-9] "rho Dra". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-05-30.

[Eggleton2008-10] Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.

[Mishenina1997-11] Mishenina, T. V.; Tsymbal, V. V. (September 1997), "Li and CNO abundances in the atmospheres of nine peculiar giants", Astronomy Letters, 23 (5): 609–614, Bibcode:1997AstL...23..609M.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

Agama	Bahasa	Biografi	Budaya	Ekonomi	Elektronika
Film	Filsafat	Geografi	Indonesia	Ilmu	Lingkungan
Masyarakat	Matematika	Militer	Mitologi	Musik	Olahraga
Pendidikan	Politik	Sastra	Sejarah	Seni	Teknologi

Rho Draconis

References

Portal di Ensiklopedia Dunia