Lambda Columbae

λ Columbae

A light curve for Lambda Columbae, plotted from TESS data.[1] The 0.64 day period is marked in red.
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 53m 06.88101s[2]
Declination −33° 48′ 04.9079″[2]
Apparent magnitude (V) 4.86[3]
Characteristics
Spectral type B5 V[4]
U−B color index −0.57[3]
B−V color index −0.15[3]
Variable type Suspected rotating ellipsoidal[5]
Astrometry
Radial velocity (Rv)+30.0[6] km/s
Proper motion (μ) RA: −4.72[2] mas/yr
Dec.: +31.32[2] mas/yr
Parallax (π)9.75 ± 0.21 mas[2]
Distance335 ± 7 ly
(103 ± 2 pc)
Absolute magnitude (MV)−0.17[7]
Details
Mass4.0±0.1[4] M☉
Radius3.4[8] R☉
Luminosity213[9] L☉
Surface gravity (log g)4.22[10] cgs
Temperature13,524[9] K
Metallicity [Fe/H]−0.06[10] dex
Rotational velocity (v sin i)88[11] km/s
Age56.6±26.1[4] Myr
Other designations
λ Col, CD−33° 2599, HD 39764, HIP 27810, HR 2056, SAO 196276.[12]
Database references
SIMBADdata

Lambda Columbae, Latinized from λ Columbae, is a probable binary star[13] in the southern constellation of Columba. With an apparent visual magnitude of 4.86,[3] it is faintly visible to the naked eye. The measured annual parallax shift of 9.75 mas[2] yields an estimated distance of roughly 335 light years.

Lambda Columbae has a stellar classification of B5 V,[4] 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.[5] It has an estimated age of around 57 million years.[4]

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]

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Tetzlaff2011 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Samus2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference cadars2001 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Hempel2003 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference uesugi_fukuda1970 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Morris1985 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Hoffleit1996 was invoked but never defined (see the help page).
  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. ^ Cite error: The named reference Allen1963 was invoked but never defined (see the help page).