UX Orionis

UX Orionis

A visual-band light curve for UX Orionis, plotted from ASAS data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Orion
Right ascension 05h 04m 29.9879s[2]
Declination −03° 47′ 14.287″[2]
Apparent magnitude (V) 9.4 – 12.7[3]
Characteristics
Spectral type A3ea[3]
Variable type UX Ori[3]
Astrometry
Proper motion (μ) RA: 1.056±0.028 mas/yr[2]
Dec.: -3.998±0.019 mas/yr[2]
Parallax (π)3.1004±0.0285 mas[2]
Distance1,052 ± 10 ly
(323 ± 3 pc)
Details
Mass1.91+0.04
−0.00[4] M☉
Radius1.7[4][a] R☉
Luminosity13.2+5.0
−4.9[4] L☉
Surface gravity (log g)3.75±0.12[4] cgs
Temperature8,500±250[4] K
Rotational velocity (v sin i)143[5] km/s
Age9.84+0.17
−0.00[4] Myr
Other designations
HD 293782, HIP 23602, GSC 04758-00134, 2MASS J05042998-0347142, Gaia DR3 3212878018378138752[6]
Database references
SIMBADdata

UX Orionis is a variable star in the constellation of Orion. It is a Herbig Ae star, located about 1,000 light-years from Earth.[7] At its brightest it is a magnitude 9.4 object, so it is too faint to be seen with the naked eye.[3] UX Orionis is the prototype of the UX Orionis class of variable stars (often called "UXors"), which are young stellar objects that exhibit large (greater than 2.8 magnitude), irregular changes in visual-band brightness.[3][8] UX Orionis was discovered by Henrietta Swan Leavitt.[3]

UX Orionis is surrounded by a circumstellar disk, and the star's photometric variability appears to be caused by episodes during which the star is obscured by dusty material within the circumstellar disk.[7]

Notes

  1. ^ Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772 K:

References

  1. ^ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 10 November 2022.
  2. ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  3. ^ a b c d e f "UX Ori". The International Variable Star Index. AAVSO. Retrieved 31 May 2026.
  4. ^ a b c d e f Mendigutía, I.; Campbell-White, J.; Montesinos, B.; Maldonado, J.; Fullana-García, L.; Mirouh, G. M.; Meeus, G.; Vioque, M.; Sicilia-Aguilar, A.; Zapatero-Osorio, M. R.; Villaver, E.; Kahar, R. (2026-04-06). "Lithium and the evolution of intermediate-mass T Tauri and Herbig stars. Rotation, accretion, and planets". Astronomy & Astrophysics. arXiv:2604.05040. doi:10.1051/0004-6361/202659302. ISSN 0004-6361.
  5. ^ Glebocki, R.; Gnacinski, P. (2005). "VizieR Online Data Catalog: Catalog of Stellar Rotational Velocities (Glebocki+ 2005)". VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G; 2005yCat.3244....0G. 3244. Bibcode:2005yCat.3244....0G.
  6. ^ "UX Ori". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 November 2022.
  7. ^ a b Kreplin, A.; Madlener, D.; Chen, L.; Weigelt, G.; Kraus, S.; Grinin, V.; Tambovtseva, L.; Kishimoto, M. (May 2016). "Resolving the inner disk of UX Orionis" (PDF). Astronomy and Astrophysics. 590: A96. Bibcode:2016A&A...590A..96K. doi:10.1051/0004-6361/201628281.
  8. ^ Herbst, W.; Herbst, D. K.; Grossman, E. J.; Weinstein, D. (November 1994). "Catalogue of UBVRI Photometry of T Tauri Stars and Analysis of the Causes of Their Variability". Astronomical Journal. 108: 1906. Bibcode:1994AJ....108.1906H. doi:10.1086/117204.

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