Omicron Aurigae

Omicron Aurigae, Latinized from ο Aurigae, is the Bayer designation for an astrometric binary[10] star system in the northern constellation of Auriga. With an apparent visual magnitude of 5.47,[2] it is faintly visible to the naked eye. Based upon an annual parallax shift of 7.89 ± 0.84 mas,[1] it is approximately 413 light-years (127 parsecs) distant from Earth. The star is a member of the Ursa Major stream of co-moving stars.[11]

Omicron Aurigae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Auriga
Right ascension  05h 45m 54.04306s[1]
Declination +49° 49′ 34.6097″[1]
Apparent magnitude (V) +5.47[2]
Characteristics
Spectral type A1 Cr Eu[3]
U−B color index +0.02
B−V color index +0.02[4]
Astrometry
Radial velocity (Rv)−7.7±0.9[5] km/s
Proper motion (μ) RA: −6.97[1] mas/yr
Dec.: −1.22[1] mas/yr
Parallax (π)7.89 ± 0.84[1] mas
Distanceapprox. 410 ly
(approx. 130 pc)
Absolute magnitude (MV)−0.03[6]
Details
Luminosity95[6] L☉
Temperature8,660[7] K
Rotational velocity (v sin i)29[8] km/s
Other designations
ο Aur, 27 Aur, BD+49° 1398, FK5 216, HD 38104, HIP 27196, HR 1971, SAO 40583[9]
Database references
SIMBADdata

The visible component is a chemically peculiar star with a stellar classification of A1 Cr Eu; meaning this is an A-type star with a spectrum that shows abnormally high abundances of chromium (Cr) and europium (Eu).[3] A magnetic field has been detected and it is a source of X-ray emission with a luminosity of: log Lx = 29.1.[11] It is spinning with a projected rotational velocity of 29 km/s[8] and is radiating 95[6] times the Sun's luminosity from its photosphere at an effective temperature of 8,660 K.[7]

References
  1. 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.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
  3. Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars" (PDF), Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788.
  4. Deutschman, W. A.; et al. (February 1976), "The galactic distribution of interstellar absorption as determined from the Celescope catalog of ultraviolet stellar observations and a new catalogue of UBV, Hbeta photoelectric observations", Astrophysical Journal Supplement Series, 30: 97–225, Bibcode:1976ApJS...30...97D, doi:10.1086/190359.
  5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  6. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  7. McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427: 343, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  8. Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics, 393: 897–911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943.
  9. "omi Aur". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-28.
  10. Makarov, V. V.; Kaplan, G. H. (May 2005), "Statistical Constraints for Astrometric Binaries with Nonlinear Motion", The Astronomical Journal, 129 (5): 2420–2427, Bibcode:2005AJ....129.2420M, doi:10.1086/429590.
  11. Panzera, M. R.; et al. (August 1999), "X-ray emission from A0-F6 spectral type stars", Astronomy and Astrophysics, 348: 161–169, arXiv:astro-ph/9906221, Bibcode:1999A&A...348..161P.
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