Omicron Arietis
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Aries |
| Right ascension | 02h 44m 32.97317s[1] |
| Declination | +15° 18′ 42.7085″[1] |
| Apparent magnitude (V) | +5.78[2] |
| Distance | 594 ± 35 ly (182 ± 11[1] pc) |
| Spectral type | B9 Vn[3] |
| Other designations | |
Omicron Arietis (ο Ari, ο Arietis) is the Bayer designation for a star in the northern constellation of Aries. Based upon an annual parallax shift of 5.49 ± 0.32 mas,[1] it is 594 ± 35 light-years (182 ± 11 parsecs) distant from Earth. This star has an apparent visual magnitude of +5.78,[2] which means it is dimly visible to the naked eye.
This is a B-type main sequence star with a stellar classification of B9 Vn.[3] The 'n' suffix indicates that it has nebulous absorption lines in its spectrum, which are caused by the Doppler effect and rapid rotation. Indeed, it has a projected rotational velocity of 225 km/s.[4]
References
- 1 2 3 4 van Leeuwen, F. (November 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
- 1 2 3 "omi Ari -- Star", SIMBAD Astronomical Object Database (Centre de Données astronomiques de Strasbourg), retrieved 2012-08-08
- 1 2 Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal 77: 750–755, Bibcode:1972AJ.....77..750C, doi:10.1086/111348.
- ↑ Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224.
External links
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