Lambda Columbae

Lambda Columbae, Latinized from λ Columbae, is a probable binary star[12] in the southern constellation of Columba. With an apparent visual magnitude of 4.86,[2] it is faintly visible to the naked eye. The measured annual parallax shift of 9.75 mas[1] yields an estimated distance of roughly 335 light years.

λ Columbae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 53m 06.88101s[1]
Declination −33° 48′ 04.9079″[1]
Apparent magnitude (V) 4.86[2]
Characteristics
Spectral type B5 V[3]
U−B color index −0.57[2]
B−V color index −0.15[2]
Variable type Suspected rotating ellipsoidal[4]
Astrometry
Radial velocity (Rv)+30.0[5] km/s
Proper motion (μ) RA: −4.72[1] mas/yr
Dec.: +31.32[1] mas/yr
Parallax (π)9.75 ± 0.21[1] mas
Distance335 ± 7 ly
(103 ± 2 pc)
Absolute magnitude (MV)−0.17[6]
Details
Mass4.0±0.1[3] M☉
Radius3.4[7] R☉
Luminosity213[8] L☉
Surface gravity (log g)4.22[9] cgs
Temperature13,524[8] K
Metallicity [Fe/H]−0.06[9] dex
Rotational velocity (v sin i)88[10] km/s
Age56.6±26.1[3] Myr
Other designations
λ Col, CD−33° 2599, HD 39764, HIP 27810, HR 2056, SAO 196276.[11]
Database references
SIMBADdata

Lambda Columbae has a stellar classification of B5 V,[3] indicating that it is a B-type main sequence star. It is a suspected rotating ellipsoidal variable[13] with a period of 0.64 days and an amplitude of 0.07 magnitude.[14] Confirmation would indicate that this is a close binary system.[4] It has an estimated age of around 57 million years.[3]

In Chinese, 子 (Zǐ), meaning Son, refers to an asterism consisting of λ Columbae and β Columbae.[15] Consequently, λ Columbae itself is known as 子一 (Zǐ yī, English: the First Star of Son.).[16] From this Chinese name, the name Tsze is derived.[17]

References
  1. 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.
  2. Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", SIMBAD, Bibcode:1986EgUBV........0M.
  3. Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x.
  4. Samus, N.N.; Durlevich, O.V.; et al. (March 2012), General Catalog of Variable Stars, Institute of Astronomy of Russian Academy of Sciences and Sternberg State Astronomical Institute of the Moscow State University.
  5. Wilson, R. E. (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.c. Publication, Carnegie Institute of Washington, D.C., Bibcode:1953GCRV..C......0W.
  6. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  7. Pasinetti Fracassini, L. E.; et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics (3rd ed.), 367: 521–24, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  8. 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.
  9. Hempel, M.; Holweger, H. (September 2003), "Abundance analysis of late B stars. Evidence for diffusion and against weak stellar winds", Astronomy and Astrophysics, 408: 1065–1076, Bibcode:2003A&A...408.1065H, doi:10.1051/0004-6361:20030889.
  10. Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory, University of Kyoto, Bibcode:1970crvs.book.....U.
  11. "lam Col". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-12-26.
  12. 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.
  13. Morris, S. L. (August 1985), "The ellipsoidal variable stars", Astrophysical Journal, Part 1, 295: 143–152, Bibcode:1985ApJ...295..143M, doi:10.1086/163359.
  14. Hoffleit, Dorrit (1996), "A Catalogue of Correlations Between Eclipsing Binaries and Other Categories of Double Stars", The Journal of the American Association of Variable Star Observers, 24 (2): 105–116, Bibcode:1996JAVSO..24..105H.
  15. (in Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
  16. (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 16 日
  17. Allen, Richard Hinckley (1963), "Columba Noae, Noah's Dove", Star Names: their Lore and Meaning (Dover ed.).
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.