Astronomy:Omicron Aurigae
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 05h 45m 54.042s[2] |
| Declination | +49° 49′ 34.58″[2] |
| Apparent magnitude (V) | +5.47[3] |
| Characteristics | |
| Spectral type | A1 Cr Eu[4] |
| U−B color index | +0.02 |
| B−V color index | +0.02[5] |
| Astrometry | |
| Radial velocity (Rv) | −7.7±0.9[6] km/s |
| Proper motion (μ) | RA: −11.087[2] mas/yr Dec.: +3.703[2] mas/yr |
| Parallax (π) | 8.1876 ± 0.2643[2] mas |
| Distance | 400 ± 10 ly (122 ± 4 pc) |
| Absolute magnitude (MV) | −0.03[1] |
| Details | |
| Mass | 1.9[7] M☉ |
| Radius | 3.2[7] R☉ |
| Luminosity | 50[7] L☉ |
| Surface gravity (log g) | 3.7[7] cgs |
| Temperature | 8,300[7] K |
| Rotational velocity (v sin i) | 35.2±5.3[7] km/s |
| Age | 657[8] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Omicron Aurigae is an astrometric binary[10] star system in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ο Aurigae, and abbreviated Omicron Aur or ο Aur. With an apparent visual magnitude of 5.47,[3] it is faintly visible to the naked eye. Based upon an annual parallax shift of 8.19 mas,[2] it is approximately 400 light-years (120 parsecs) distant from Earth. It is drifting closer to the Sun with a radial velocity of −8 km/s.[6] The star is a member of the Ursa Major stream of co-moving stars.[11]
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 anomalously high abundances of chromium (Cr) and europium (Eu).[4] A magnetic field has been detected and it is a source of X-ray emission with a luminosity of: log Lx = 29.1.[11] The star has 1.9 times the mass of the Sun and 3.2 times the Sun's radius. It is spinning with a projected rotational velocity of 35 km/s and is radiating 50 times the Sun's luminosity from its photosphere at an effective temperature of 8,300 K.[7]
References
- ↑ 1.0 1.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. XHIP record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940. Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics 498 (3): 961–966, doi:10.1051/0004-6361/200810788, Bibcode: 2009A&A...498..961R.
- ↑ 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, doi:10.1086/190359, Bibcode: 1976ApJS...30...97D.
- ↑ 6.0 6.1 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 Moiseeva, A. V. et al. (January 2019), "Fundamental Parameters of CP Stars Observed at the 6-m Telescope. I. Observations in 2009–2011", Astrophysical Bulletin 74 (1): 62–65, doi:10.1134/S1990341319010061, Bibcode: 2019AstBu..74...62M.
- ↑ Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A. et al. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics 669: A104. doi:10.1051/0004-6361/202244283. Bibcode: 2023A&A...669A.104K.
- ↑ "omi Aur". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=omi+Aur.
- ↑ Makarov, V. V.; Kaplan, G. H. (May 2005), "Statistical Constraints for Astrometric Binaries with Nonlinear Motion", The Astronomical Journal 129 (5): 2420–2427, doi:10.1086/429590, Bibcode: 2005AJ....129.2420M.
- ↑ 11.0 11.1 Panzera, M. R. et al. (August 1999), "X-ray emission from A0-F6 spectral type stars", Astronomy and Astrophysics 348: 161–169, Bibcode: 1999A&A...348..161P.
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