Xi Columbae
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 05h 55m 29.91727s[1] |
| Declination | −37° 07′ 14.4156″[1] |
| Apparent magnitude (V) | 4.97[2] |
| Characteristics | |
| Spectral type | K1 III CNII[3] |
| B−V color index | +1.096[2] |
| Astrometry | |
| Radial velocity (Rv) | +59.5[4] km/s |
| Proper motion (μ) | RA: +36.90[1] mas/yr Dec.: −25.35[1] mas/yr |
| Parallax (π) | 9.80 ± 0.37[1] mas |
| Distance | 330 ± 10 ly (102 ± 4 pc) |
| Absolute magnitude (MV) | −0.05[5] |
| Orbit[5] | |
| Period (P) | 1420.6 d |
| Semi-major axis (a) | 3.60 AU |
| Eccentricity (e) | 0.39 |
| Semi-amplitude (K1) (primary) | 5.68 km/s |
| Details | |
| Luminosity | 132[6] L☉ |
| Surface gravity (log g) | 2.26[2] cgs |
| Temperature | 4,659[2] K |
| Metallicity [Fe/H] | +0.29[2] dex |
| Rotational velocity (v sin i) | 2.6[5] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Xi Columbae is a binary star[5] system in the southern constellation of Columba. With an apparent visual magnitude of 4.97,[2] it is faintly visible to the naked eye. To ancient Arabian astronomers, this star, along with ζ CMa, λ CMa, γ Col, δ Col, θ Col, κ Col, λ Col and μ Col, formed Al Ḳurūd (ألقرد - al-qird), the Apes.[8] Based upon an annual parallax shift of 9.80 mas,[1] it is located around 330 light years from the Sun.
This is an astrometric binary[9] with an orbital period of 1,420.6 days and an eccentricity of 0.39.[5] The primary is an evolved K-type giant star with a stellar classification of K1 III CNII.[3] It is a member of the HR 1614 supergroup[10] and shows an overabundance of CN.[3] The companion has a mass of at least 59% that of the Sun.[5]
References
- 1 2 3 4 5 6 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.
- 1 2 3 4 5 6 Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, 88.
- 1 2 3 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
- ↑ Wilson, Ralph Elmer (1953), General Catalogue of Stellar Radial Velocities, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
- 1 2 3 4 5 6 Setiawan, J.; et al. (July 2004), "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch", Astronomy and Astrophysics, 421: 241–254, Bibcode:2004A&A...421..241S, doi:10.1051/0004-6361:20041042-1.
- ↑ 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.
- ↑ "ksi Col -- Star", SIMBAD Astronomical Database, Centre de Données astronomiques de Strasbourg, retrieved 2016-12-31.
- ↑ Davis Jr., G. A. (October 1944), "The Pronunciations, Derivations, and Meanings of a Selected List of Star Names", Popular Astronomy, 18: 14, Bibcode:1944PA.....52....8D.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
- ↑ Eggen, Olin J. (August 1997), "The Abundance of CN, Calcium and Heavy Elements in High Velocity Stars.", The Astronomical Journal, 114: 825–836, Bibcode:1997AJ....114..825E, doi:10.1086/118516.