Beta Columbae

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β Columbae
Template:Location mark
Location of β Columbae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.105[2]
Characteristics
Spectral type K1 IIICN+1[3]
U−B Template:Engvar +1.189[2]
B−V Template:Engvar +1.162[2]
R−I Template:Engvar +0.58[4]
Astrometry
Radial velocity (Rv)+88.9[5] km/s
Proper motion (μ) RA: +54.77[1] mas/yr
Dec.: 404.20[1] mas/yr
Parallax (π)37.41±0.12 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+1.01[6]
Details
Mass1.10 ± 0.20[7] Template:Solar mass
Radius11.5[8] Template:Solar radius
Luminosity (bolometric)56[9] Template:Solar luminosity
Surface gravity (log g)2.62[3] cgs
Temperature4,545[3] K
Metallicity [Fe/H]0.11[3] dex
Age2[10] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
β Col, Beta Columbae, Beta Col, CD−35 2546, CPD−35 752, FK5 223, GC 7364, HD 39425, HIP 27628, HR 2040, LTT 2392, NLTT 15724, PPM 281952, SAO 196240.[11]
Database references
SIMBADdata

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Beta Columbae (β Columbae, abbreviated Beta Col, β Col), officially named Wazn Template:IPAc-en,[12] is the second-brightest star in the southern constellation of Columba.[10] It has an apparent visual magnitude of 3.1,[2] which is bright enough to be viewed with the naked eye even from an urban location. Parallax measurements place it at a distance of about Script error: No such module "convert". from the Sun.[1]


Nomenclature

Beta Columbae is the star's Bayer designation. It has the traditional name Wazn (or Wezn) from the Arabic وزن "weight".[4][10] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[13] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[14] included a table of the first two batches of names approved by the WGSN; which included Wazn for this star.

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Son, refers to an asterism consisting of Beta Columbae and Lambda Columbae.[15] Consequently, Beta Columbae itself is known as Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[16]

Properties

The spectrum of Beta Columbae matches a stellar classification of K1 IIICN+1,[11] where the 'III' luminosity class indicates this is a giant star that has exhausted the supply of hydrogen at its core and evolved away from the main sequence of stars like the Sun. The notation 'CN+1' indicates a higher than normal level of cyanogen (CN) absorption in the atmosphere of the star.[17] The interferometry-measured angular diameter of this star, after correcting for limb darkening, is 3.99 ± 0.05 mas,[18] which, at its estimated distance, equates to a physical radius of about 11.5 times the radius of the Sun.[8] Despite having expanded to this radius, Beta Columbae only has about a 10% greater mass than the Sun.[7] The outer envelope of this star is radiating energy at an effective temperature of 4,545 K,[3] resulting an orange[19] hue that is typical of a cool, K-type star.[20]

Beta Columbae has a high proper motion across the celestial sphere[21] and is moving at an unusually large speed of 100 km s−1 relative to the Sun.[10] About 107,200 years ago, it made a close approach to the Beta Pictoris system. The estimated separation of the two stars at this time was around Script error: No such module "convert". and Beta Columbae may have perturbed outlying planetesimals within the debris disk surrounding Beta Pictoris.[21]

References

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  1. ↑ a b c d e f Script error: No such module "citation/CS1".
  2. ↑ a b c d Script error: No such module "citation/CS1".
  3. ↑ a b c d e Script error: No such module "citation/CS1".
  4. ↑ a b HR 2040, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line September 5, 2008.
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ a b Script error: No such module "citation/CS1".
  8. ↑ a b Script error: No such module "citation/CS1".. The radius (R*) is given by:
    2⋅R*=(10−3⋅(26.73⋅3.99) AU0.0046491 AU/R⨀≈22.9⋅R⨀
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ a b c d Script error: No such module "citation/CS1".
  11. ↑ a b NLTT 15724 -- High proper-motion Star, database entry, SIMBAD. Accessed on line September 5, 2008.
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Script error: No such module "citation/CS1".
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
  16. ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ Script error: No such module "citation/CS1".
  19. ↑ Script error: No such module "citation/CS1".
  20. ↑ Script error: No such module "citation/CS1".
  21. ↑ a b Script error: No such module "citation/CS1".

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Template:Stars of Columba

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