Xi Arietis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Aries |
| Right ascension | 02h 24m 49.05655s[1] |
| Declination | +10° 36′ 38.0236″[1] |
| Apparent magnitude (V) | +5.46[2] |
| Characteristics | |
| Spectral type | B7 IV[3] |
| U−B color index | −0.48[2] |
| B−V color index | −0.10[2] |
| Astrometry | |
| Proper motion (μ) | RA: +20.09[1] mas/yr Dec.: −14.79[1] mas/yr |
| Parallax (π) | 3.74 ± 0.29 mas[1] |
| Distance | 870 ± 70 ly (270 ± 20 pc) |
| Absolute magnitude (MV) | −0.43[4] |
| Details | |
| Mass | 3.9[5] M☉ |
| Surface gravity (log g) | 3.897±0.017[5] cgs |
| Temperature | 13627±100[5] K |
| Rotational velocity (v sin i) | 164±8[5] km/s |
| Age | 195[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Xi Arietis, Latinized from ξ Arietis, is the Bayer designation for a binary star[7] system in the northern constellation of Aries. It has an apparent visual magnitude of 5.46,[2] and so is dimly visible to the naked eye. Based upon an annual parallax shift of 3.74±0.29 mas as seen from Earth, it is 872 ± 68 light-years (267 ± 21 parsecs) distant from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.24 due to interstellar dust.[4]
This is a double-lined spectroscopic binary.[7] The spectrum matches a stellar classification of B7 IV,[3] which would indicate a subgiant star that has exhausted the supply of hydrogen at its core and is in the process of evolving into a giant star. Xi Arietis was once a designation for Psi Ceti (ψ Cet, ψ Ceti), and was later recognized to be a duplicate by Bayer.[8]
References
[edit]- ^ a b c d e 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, S2CID 18759600.
- ^ a b c d Crawford, D. L.; et al. (1971), "Four-color, H-beta, and UBV photometry for bright B-type stars in the northern hemisphere", The Astronomical Journal, 76: 1058, Bibcode:1971AJ.....76.1058C, doi:10.1086/111220.
- ^ a b Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement, 17: 371, Bibcode:1968ApJS...17..371L, doi:10.1086/190179.
- ^ a b c 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.
- ^ a b c d Huang, Wenjin; et al. (October 2010), "A Stellar Rotation Census of B Stars: From ZAMS to TAMS", The Astrophysical Journal, 722 (1): 605–619, arXiv:1008.1761, Bibcode:2010ApJ...722..605H, doi:10.1088/0004-637X/722/1/605, S2CID 118532653.
- ^ "ksi Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-28.
- ^ a b Chini, R.; et al. (2012), "A spectroscopic survey on the multiplicity of high-mass stars", Monthly Notices of the Royal Astronomical Society, 424 (3): 1925, arXiv:1205.5238, Bibcode:2012MNRAS.424.1925C, doi:10.1111/j.1365-2966.2012.21317.x, S2CID 119120749.
- ^ Ridpath, Ian, "Bayer's Uranometria and Bayer letters", Star Tales.
