Beta Corvi
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Beta Corvi or β Corvi, officially named Kraz (Template:IPAc-en),[1] is the second-brightest star in the southern constellation of Corvus with an apparent visual magnitude of 2.647.[2] Based on parallax measurements obtained during the Hipparcos mission, it is about Template:Convert distant from the Sun.[3]
Nomenclature
β Corvi (Latinised to Beta Corvi) is the star's Bayer designation.
In a 1951 publication, Atlas Coeli (Skalnate Pleso Atlas of the Heavens) by Czech astronomer Antonín Bečvář, it bore the name Kraz, whose origin and meaning remain unknown.[4][5][6]
In 2016, the IAU organized a Working Group on Star Names (WGSN)[7] to catalog and standardize proper names for stars. The WGSN approved the name Kraz for this star on 1 June 2018 and it is now so included in the List of IAU-approved Star Names.[1]
In Chinese, Template:Lang (Template:Lang), meaning Chariot (asterism), refers to an asterism consisting of Beta, Gamma, Epsilon and Delta Corvi.[8] Consequently, Beta Corvi itself is known as Template:Lang (Template:Lang, Template:Langx).[9]
Properties
Beta Corvi has about 3.3 times the Sun's mass and is roughly 300 million years old,[10] which is old enough for a star of this mass to consume the hydrogen at its core and evolve away from the main sequence. The stellar classification is G5 II,[11] with the luminosity class of 'II' indicating this is a bright giant. The effective temperature of the star's outer envelope is about 5,325 K,[12] which produces a yellow hue common to G-type stars.[13]
Currently, Beta Corvi has expanded to 15.8[14] times the Sun's size and is emitting about 175 times the luminosity of the Sun. The abundance of elements other than hydrogen or helium, what astronomers term metallicity, is 1.38 times that of the Sun.[12]Template:Efn
This is a variable star that ranges in apparent visual magnitude from a low of 2.66 to a high of 2.60.[15]
See also
- List of stars in Corvus
- Beta Leporis, another bright giant star with similar size and spectral type
Notes
References
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- ↑ 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.
- ↑ 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.
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