Xi Eridani
ξ Eridani (Latinised as Xi Eridani) is a solitary[6] star in the constellation Eridanus. With an apparent visual magnitude of 5.17,[2] it is faintly visible to the naked eye on a clear, dark night. Based upon an annual parallax shift of 0.00156 arcseconds,[1] it is located around 209 light years from the Sun. The star is considered a member of the Sirius supercluster.[5]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 04h 23m 40.85270s[1] |
| Declination | −03° 44′ 43.6771″[1] |
| Apparent magnitude (V) | 5.17[2] |
| Characteristics | |
| Spectral type | A2 V[3] |
| U−B color index | +0.08[2] |
| B−V color index | +0.08[2] |
| Astrometry | |
| Radial velocity (Rv) | −11.0[4] km/s |
| Proper motion (μ) | RA: −47.36[1] mas/yr Dec.: −54.91[1] mas/yr |
| Parallax (π) | 15.60 ± 0.25 mas[1] |
| Distance | 209 ± 3 ly (64 ± 1 pc) |
| Absolute magnitude (MV) | +1.59[5] |
| Details | |
| Mass | 2.29[6] M☉ |
| Radius | 2.2[7] R☉ |
| Luminosity | 27.6[8] L☉ |
| Surface gravity (log g) | 3.73[9] cgs |
| Temperature | 8,400[8] K |
| Rotational velocity (v sin i) | 194.3±2.3[3] km/s |
| Age | 450[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is an ordinary A-type main sequence star with a stellar classification of A2 V,[3] indicating that it is generating energy through the thermonuclear fusion of hydrogen into helium in its core region. It is around 450[6] million years old and has a relatively high rate of rotation with a projected rotational velocity of 194 km/s.[3] The star has about 2.3 times the mass of the Sun,[6] 2.2 times the Sun's radius,[7] and radiates 27.6[8] times the solar luminosity from its outer atmosphere at an effective temperature of 8,400 K.[8]
References
- ^ a b c d e f 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- ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", SIMBAD, Bibcode:1986EgUBV........0M.
- ^ a b c d Díaz, C. G.; et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics, 531: A143, arXiv:1012.4858, Bibcode:2011A&A...531A.143D, doi:10.1051/0004-6361/201016386, S2CID 119286673.
- ^ Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, Veröffentlichungen des Astronomisches Rechen-Institut Heidelberg, 35: 1, Bibcode:1999VeARI..35....1W.
- ^ a b Eggen, Olin J. (August 1998), "The Sirius Supercluster and Missing Mass near the Sun", The Astronomical Journal, 116 (2): 782–788, Bibcode:1998AJ....116..782E, doi:10.1086/300465.
- ^ a b c d e De Rosa, R. J.; et al. (January 2014), "The VAST Survey – III. The multiplicity of A-type stars within 75 pc", Monthly Notices of the Royal Astronomical Society, 437 (2): 1216–1240, arXiv:1311.7141, Bibcode:2014MNRAS.437.1216D, doi:10.1093/mnras/stt1932.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) – Third edition – Comments and statistics", Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b c d McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ King, Jeremy R.; et al. (April 2003), "Stellar Kinematic Groups. II. A Reexamination of the Membership, Activity, and Age of the Ursa Major Group", The Astronomical Journal, 125 (4): 1980–2017, Bibcode:2003AJ....125.1980K, doi:10.1086/368241.
- ^ "* ksi Eri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-11-03.