Xi Leonis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo |
| Right ascension | 09h 31m 56.73886s[1] |
| Declination | +11° 17′ 59.3933″[1] |
| Apparent magnitude (V) | 5.1437[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| U−B color index | +0.88[4] |
| B−V color index | +1.03[4] |
| Astrometry | |
| Radial velocity (Rv) | 34.85±0.26[2] km/s |
| Proper motion (μ) | RA: −89.98[1] mas/yr Dec.: −81.85[1] mas/yr |
| Parallax (π) | 15.13 ± 0.31 mas[1] |
| Distance | 216 ± 4 ly (66 ± 1 pc) |
| Absolute magnitude (MV) | 0.663[5] |
| Details | |
| Radius | 12[6] R☉ |
| Luminosity | 60[6] L☉ |
| Surface gravity (log g) | 2.7[6] cgs |
| Temperature | 4,688[6] K |
| Metallicity [Fe/H] | −0.17[6] dex |
| Rotational velocity (v sin i) | 0.0[6] km/s |
| Age | 3.89±2.03[5] Gyr |
| Other designations | |
Xi Leonis (ξ Leo, ξ Leonis) is a solitary star in the zodiac constellation of Leo. It has an apparent visual magnitude of 5.1[2] and is faintly visible to the naked eye. The distance to this star, as determined by parallax measurements, is roughly 216 light years.
This is an evolved, K-type giant star with a stellar classification of K0 III.[3] At an age of around four billion years, it has expanded to 12 times the radius of the Sun and shines with 60 times the Sun's luminosity. The effective temperature of the star's outer atmosphere is 4,688.[6] In the General Catalogue of Variable Stars, it is listed as a suspected variable star with a maximum magnitude of 4.97.[8]
References
- ^ 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.
- ^ a b c Famaey, B.; et al. (2005), "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters", Astronomy and Astrophysics, 430: 165–186, arXiv:astro-ph/0409579, Bibcode:2005A&A...430..165F, doi:10.1051/0004-6361:20041272.
- ^ a b Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51, Bibcode:1962RGOB...51...79E.
- ^ a b Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, Bibcode:1986EgUBV........0M.
- ^ a b Soubiran, C.; et al. (2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788.
- ^ a b c d e f g Massarotti, Alessandro; et al. (January 2008), "Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
- ^ "ksi Leo -- Variable Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-09-29.
- ^ Samus, N. N.; Durlevich, O. V.; et al. (2007), Combined General Catalogue of Variable Stars (GCVS4.2), retrieved 2016-09-30. VizieR On-line Data Catalog: B/gcvs.
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