Cor Caroli
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2008-07-10T16:09:37Z
Kbdankbot
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Robot - move category per [[WP:CFD|CFD]] [[Wikipedia:Categories for discussion/Log/2008 July 2|2008 July 2]]
{{Starbox short |
| name=α<sup>1,2</sup> Canum Venaticorum
| epoch=[[J2000.0]]
| constell=[[Canes Venatici]]
| ra=12<sup>h</sup>56<sup>m</sup>01.7<sup>s</sup>
| dec=+38°19′06″
| spectral=F0V/A0pSiEuHg
| appmag_v=+2.89/+5.61
| dist_ly=110 ± 4
| dist_pc=34 ± 1
| names=Cor Caroli, 12 Canum Venaticorum, [[Harvard Revised catalogue|HR]] 4914/4915, [[Henry Draper Catalogue|HD]] 112412/112413, [[Bonner Durchmusterung|BD]]+39°2580, [[Fifth Fundamental Catalogue|FK5]] 485, [[Hipparcos catalogue|HIP]] 63121/63125, [[Smithsonian Astrophysical Observatory catalogue|SAO]] 63256/63257, GC 17556/17557, [[Star catalogue#ADS|ADS]] 8706, CCDM 12560+3819
}}
'''Cor Caroli''' (α CVn / α Canum Venaticorum / [[Alpha (letter)|Alpha]] Canum Venaticorum, originally known by the more elaborate ''Cor Caroli Regis Martyris'') is the brightest [[star]] in the northern [[constellation]] [[Canes Venatici]]. The name ''Cor Caroli'' means ''Charles' heart'', and was named by [[Sir Charles Scarborough]] in honour of [[Charles I of England|Charles I]]<ref>[http://www.space.com/spacewatch/hunting_dog_020517.html space.com: Spacewatch Friday: In Search of Star Cities, By Joe Rao]</ref><ref>[http://www.ianridpath.com/startales/canesvenatici.htm Ian Ridpath: "Star Tales", Canes Venatici]</ref>, who was executed in the aftermath of the [[English Civil War]], and otherwise associated to [[Charles II of England]], his son, who was restored to the throne after the [[interregnum]] following his father's death.
Cor Caroli is a [[binary star]] which has a combined [[apparent magnitude]] of +2.89. The two stars are 19.6 [[arcsecond]]s apart on the sky and are easily resolved in small telescopes. It is approximately 110 [[light year]]s from [[Earth]].
The main star, '''α² Canum Venaticorum''', is the prototype of a class of [[variable star]]s, the so-called [[α² Canum Venaticorum star]]s. These stars have a strong [[magnetic field]], which is believed to produce starspots of enormous extent. Due to these starspots the brightness of α² Canum Venaticorum stars varies considerably during their rotation.
The brightness of α² Canum Venaticorum varies between +2.84 [[apparent magnitude|magnitude]] and +2.94 with a period of 5.47 days. Its [[stellar classification|spectral type]] is A0. The companion, '''α¹ Canum Venaticorum''', of spectral type F0, is considerably fainter at +5.5 magnitude.
Cor Caroli marks the northern vertex of the [[Diamond of Virgo]] [[asterism (astronomy)|asterism]].
==References==
<references/>
[[Category:Bayer objects|Canum Venaticorum, Alpha]]
[[Category:Canes Venatici constellation]]
[[Category:Alpha2 Canum Venaticorum variables]]
[[Category:Binary stars]]
[[Category:A-type main sequence stars]]
[[Category:F-type main sequence stars]]
[[Category:Stars with proper names]]
[[ca:Cor Caroli]]
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[[el:Καρδία Καρόλου]]
[[es:Cor Caroli]]
[[fr:Alpha2 Canum Venaticorum]]
[[ko:코르 카롤리]]
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[[lb:Cor Caroli (Stär)]]
[[nl:Cor Caroli]]
[[ja:コル・カロリ]]
[[pl:Cor Caroli]]
[[ru:Сердце Карла]]
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[[fi:Alfa Canum Venaticorum]]
[[zh:常陳一]]