# Xi Columbae

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**Xi Columbae** is a [binary star](/source/Binary_star)[1] system in the southern [constellation](/source/Constellation) of [Columba](/source/Columba_(constellation)). With an [apparent visual magnitude](/source/Apparent_visual_magnitude) of 4.97,[2] it is faintly visible to the naked eye. Based upon an annual [parallax shift](/source/Stellar_parallax) of 10.1 mas,[3] it is located around 323 [light years](/source/Light_year) from the [Sun](/source/Sun). The system is a member of the [HR 1614](/source/HR_1614) supergroup,[4] and is drifting further away with a [radial velocity](/source/Radial_velocity) of +59.5 km/s,[5]

This is an [astrometric binary](/source/Astrometric_binary)[6] with an [orbital period](/source/Orbital_period) of 1,420.6 days and an [eccentricity](/source/Orbital_eccentricity) of 0.39.[1] The primary is an [evolved](/source/Stellar_evolution) [K-type](/source/K-type_star) [giant star](/source/Giant_star) with a [stellar classification](/source/Stellar_classification) of K1 III CNII,[7] showing an overabundance of [CN](/source/Cyanide) in its [spectrum](/source/Stellar_spectrum). The star has expanded to 16 times the [radius of the Sun](/source/Radius_of_the_Sun) and is radiating 120 times the [Sun's luminosity](/source/Sun's_luminosity) from its swollen [photosphere](/source/Photosphere) at an [effective temperature](/source/Effective_temperature) of 4,743 K.[3] The companion has a mass of at least 59% that of the Sun.[1]

## References

1. 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](https://ui.adsabs.harvard.edu/abs/2004A%26A...421..241S). [doi:10.1051/0004-6361:20041042-1](https://doi.org/10.1051/0004-6361:20041042-1)

1. Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", *The Astronomical Journal*. **150** (3): 23, [arXiv:1507.01466](https://arxiv.org/abs/1507.01466). [Bibcode:2015AJ....150...88L](https://ui.adsabs.harvard.edu/abs/2015AJ....150...88L). [doi:10.1088/0004-6256/150/3/88](https://doi.org/10.1088/0004-6256/150/3/88). [S2CID 118505114](https://api.semanticscholar.org/CorpusID:118505114). 88

1. 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](https://ui.adsabs.harvard.edu/abs/1997AJ....114..825E). [doi:10.1086/118516](https://doi.org/10.1086/118516)

1. Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", *Carnegie Institute Washington D.C. Publication*, Washington: Carnegie Institution of Washington, [Bibcode:1953GCRV..C......0W](https://ui.adsabs.harvard.edu/abs/1953GCRV..C......0W)

1. 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](https://arxiv.org/abs/0806.2878). [Bibcode:2008MNRAS.389..869E](https://ui.adsabs.harvard.edu/abs/2008MNRAS.389..869E). [doi:10.1111/j.1365-2966.2008.13596.x](https://doi.org/10.1111/j.1365-2966.2008.13596.x). [S2CID 14878976](https://api.semanticscholar.org/CorpusID:14878976)

1. Houk, Nancy (1979), "Michigan catalogue of two-dimensional spectral types for the HD stars", Vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, [Bibcode:1982mcts.book.....H](https://ui.adsabs.harvard.edu/abs/1982mcts.book.....H)

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