Omicron Arietis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aries[1] |
| Right ascension | 02h 44m 32.972s[2] |
| Declination | +15° 18′ 42.70″[2] |
| Apparent magnitude (V) | +5.78[3] |
| Characteristics | |
| Spectral type | B9 Vn[4] |
| U−B color index | −0.21[5] |
| B−V color index | −0.01[5] |
| Astrometry | |
| Radial velocity (Rv) | −2.4±3.3[6] km/s |
| Proper motion (μ) | RA: +2.942 mas/yr[2] Dec.: −16.236 mas/yr[2] |
| Parallax (π) | 5.7867±0.1606 mas[2] |
| Distance | 560 ± 20 ly (173 ± 5 pc) |
| Absolute magnitude (MV) | −0.51[1] |
| Details | |
| Mass | 2.78±0.37[7] M☉ |
| Radius | 4.27±0.14[7] R☉ |
| Luminosity | 217±14[7] L☉ |
| Surface gravity (log g) | 3.62±0.07[7] cgs |
| Temperature | 10,715±186[7] K |
| Rotational velocity (v sin i) | 225[8] km/s |
| Age | 286[9] Myr |
| Other designations | |
| ο Ari, 37 Arietis, BD+14°457, GC 3303, HD 17036, HIP 12803, HR 809, SAO 93082, PPM 118501, TIC 52174783[10] | |
| Database references | |
| SIMBAD | data |
Omicron Arietis is a single,[3] blue-white-hued star in the northern constellation of Aries. Its name is a Bayer designation that is Latinised from ο Arietis, and abbreviated Omicron Ari or ο Ari. This star has an apparent visual magnitude of +5.78,[3] which means it is dimly visible to the naked eye. Based upon an annual parallax shift of 5.79 mas as seen from Earth,[2] it is located approximately 560 light-years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.22 due to interstellar dust.[9]
This is a B-type main-sequence star with a stellar classification of B9 Vn.[4] 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.[8] The star has an estimated 2.8 times the mass of the Sun and about 4.3 times the Sun's radius. It is radiating energy from its photosphere at 217 times the Sun's luminosity with an effective temperature of 10,715 K.[7]
References
[edit]- ^ a b 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. XHIP record for this object at VizieR.
- ^ a b c d e 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.
- ^ a b c Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
- ^ a b Cowley, A. (November 1972), "Spectral classification of the bright B8 stars", Astronomical Journal, 77: 750–755, Bibcode:1972AJ.....77..750C, doi:10.1086/111348.
- ^ a b Crawford, D. L. (February 1963), "U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars", Astrophysical Journal, 137: 530, Bibcode:1963ApJ...137..530C, doi:10.1086/147526.
- ^ 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, S2CID 59451347, A61.
- ^ a b c d e f Stassun, Keivan G.; et al. (October 2019), "The Revised TESS Input Catalog and Candidate Target List", The Astronomical Journal, 158 (4): 138, arXiv:1905.10694, Bibcode:2019AJ....158..138S, doi:10.3847/1538-3881/ab3467, hdl:1721.1/124721, ISSN 0004-6256, S2CID 166227927.
- ^ a b Royer, F.; et al. (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, S2CID 18475298.
- ^ a b Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
- ^ "omi Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-28.
