Beta Canum Venaticorum

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Template:Short description

β Canum Venaticorum
Template:Location mark
Location of β Canum Venaticorum (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Canes Venatici
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 4.25[2]
Characteristics
Spectral type G0 V[3]
U−B Template:Engvar 0.04[4]
B−V Template:Engvar 0.58[4]
Astrometry
Radial velocity (Rv)Script error: No such module "val".[1] km/s
Proper motion (μ) RA: −704.702[1] mas/yr
Dec.: +292.155[1] mas/yr
Parallax (π)118.0266±0.1530 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)4.64[5]
Details
MassScript error: No such module "val".[6] Template:Solar mass
RadiusScript error: No such module "val".[7] Template:Solar radius
LuminosityScript error: No such module "val".[8] Template:Solar luminosity
Surface gravity (log g)Script error: No such module "val".[8] cgs
TemperatureScript error: No such module "val".[8] K
Metallicity [Fe/H]Script error: No such module "val".[8] dex
Rotational velocity (v sin i)Script error: No such module "val".[9] km/s
Age3.4[6] to 7.1[5] Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Template:Odlist[10]
Database references
SIMBADdata
ARICNSdata

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Beta Canum Venaticorum (β Canum Venaticorum, abbreviated Beta CVn, β CVn), also named Chara Template:IPAc-en,[11][12] is the second-brightest star in the northern constellation of Canes Venatici. It is a nearby solar-type star, about Script error: No such module "convert". distant based on its parallax. The star is faintly visible to the naked eye, at an apparent magnitude of +4.25. Along with the brighter star Cor Caroli, the pair form the "southern dog" in this constellation that represents hunting dogs.

Nomenclature

β Canum Venaticorum (Latinised to Beta Canum Venaticorum) is the star's Bayer designation. It also has the Flamsteed designation 8 Canum Venaticorum.[10] The star was listed in the New General Catalogue as NGC 4530.[13][14]

The traditional name Chara was originally applied to the "southern dog", but it later became used specifically to refer to Beta Canum Venaticorum. Chara (χαρά) means 'joy' in Greek[15] but ‍‘dear’ ‍or ‍’beloved’ in Latin.[16] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[17] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[18] included a table of the first two batches of names approved by the WGSN; which included Chara for this star.

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Imperial Guards, refers to an asterism consisting of Beta Canum Venaticorum, Alpha Canum Venaticorum, 10 Canum Venaticorum, 6 Canum Venaticorum, 2 Canum Venaticorum, and 67 Ursae Majoris.[19] Consequently, the Chinese name for Beta Canum Venaticorum itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.)[20]

Characteristics

Beta CVn has a stellar classification of G0 V, and so is a G-type main-sequence star. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[21] The spectrum of this star shows a very weak emission line of singly ionized calcium (Ca II) from the chromosphere, making it a useful reference star for a reference spectrum to compare with other stars in a similar spectral category.[22] (The Ca-II emission lines are readily accessible and can be used to measure the level of activity in a star's chromosphere.)

Beta CVn is considered to be slightly metal-poor,[8] which means it has a somewhat lower portion of elements heavier than helium when compared to the Sun. In terms of mass, age and evolutionary status, however, this star is very similar to the Sun.[23] As a result, it has been called a solar analog. It is about 3% less massive than the Sun,[2] with a radius 3% larger than the Sun's and 25% greater luminosity.[7][8]

The components of this star's space velocity are (U, V, W) = (–25, 0, +2) km/s.[23] In the past it was suggested that it may be a spectroscopic binary. However, further analysis of the data does not seem to bear that out.[24] In addition, a 2005 search for a brown dwarf in orbit around this star failed to discover any such companion, at least down to the sensitivity limit of the instrument used.[25]

Habitability

In 2006, astronomer Margaret Turnbull labeled Beta CVn as the top stellar system candidate to search for extraterrestrial life forms.[26] Because of its solar-type properties, astrobiologists have listed it among the most astrobiologically interesting stars within 10 parsecs of the Sun.[23] However, as of 2009, this star is not known to host planets.[2]

See also

References

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  1. ↑ a b c d e f Template:Cite Gaia DR3
  2. ↑ a b c Script error: No such module "Citation/CS1".
  3. ↑ Script error: No such module "Citation/CS1".
  4. ↑ a b Script error: No such module "Citation/CS1".
  5. ↑ a b Script error: No such module "Citation/CS1".
  6. ↑ a b Script error: No such module "Citation/CS1".
  7. ↑ a b Script error: No such module "Citation/CS1".
  8. ↑ a b c d e f Script error: No such module "Citation/CS1". Beta Canum Venaticorum's database entry at VizieR.
  9. ↑ Script error: No such module "Citation/CS1".
  10. ↑ a b Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  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. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "citation/CS1".
  17. ↑ Script error: No such module "citation/CS1".
  18. ↑ Script error: No such module "citation/CS1".
  19. ↑ 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.
  20. ↑ 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.
  21. ↑ Script error: No such module "Citation/CS1".
  22. ↑ Script error: No such module "Citation/CS1".
  23. ↑ a b c Script error: No such module "Citation/CS1".
  24. ↑ Script error: No such module "Citation/CS1".
  25. ↑ Script error: No such module "Citation/CS1".
  26. ↑ Script error: No such module "citation/CS1".

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External links

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Template:Stars of Canes Venatici

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