Astronomy:Omicron Aurigae
| Observation data 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 |
| Distance | approx. 410 ly (approx. 130 pc) |
| Absolute magnitude (MV) | −0.03[6] |
| Details | |
| Luminosity | 95[6] L☉ |
| Temperature | 8,660[7] K |
| Rotational velocity (v sin i) | 29[8] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ 2.0 2.1 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.
- ↑ 3.0 3.1 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, https://zenodo.org/record/890529.
- ↑ 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.
- ↑ 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.
- ↑ 6.0 6.1 6.2 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 7.0 7.1 McDonald, I. et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–357, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ 8.0 8.1 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, doi:10.1051/0004-6361:20020943, Bibcode: 2002A&A...393..897R.
- ↑ "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, https://apps.dtic.mil/sti/pdfs/ADA433654.pdf.
- ↑ 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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