Astronomy:Lambda Columbae

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Short description: Variable star in the constellation Columba
λ Columbae
Location of λ Columbae (circled in red)
Observation data
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, 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.

A light curve for Lambda Columbae, plotted from TESS data.[13] The 0.64 day period is marked in red.

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[14] with a period of 0.64 days and an amplitude of 0.07 magnitude.[15] 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.[16] Consequently, λ Columbae itself is known as 子一 (Zǐ yī, English: the First Star of Son).[17] From this Chinese name, the name Tsze is derived.[18]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V. 
  2. ↑ 2.0 2.1 2.2 2.3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", SIMBAD, Bibcode: 1986EgUBV........0M. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T. 
  4. ↑ 4.0 4.1 Samus, N.N.Expression error: Unrecognized word "et". (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, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  7. ↑ Pasinetti Fracassini, L. E. et al. (2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy & Astrophysics 367: 521–24, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P. 
  8. ↑ 8.0 8.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M. 
  9. ↑ 9.0 9.1 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, doi:10.1051/0004-6361:20030889, Bibcode: 2003A&A...408.1065H. 
  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. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=lam+Col. 
  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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E. 
  13. ↑ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html. 
  14. ↑ Morris, S. L. (August 1985), "The ellipsoidal variable stars", Astrophysical Journal, Part 1 295: 143–152, doi:10.1086/163359, Bibcode: 1985ApJ...295..143M. 
  15. ↑ 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. 
  16. ↑ (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.
  17. ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 16 日
  18. ↑ Allen, Richard Hinckley (1963), "Columba Noae, Noah's Dove", Star Names: their Lore and Meaning (Dover ed.), https://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Columba_Noae*.html. 



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