Английская Википедия:Beta Aurigae
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Beta Aurigae (Latinized from β Aurigae, abbreviated Beta Aur, β Aur), officially named Menkalinan Шаблон:IPAc-en,[1][2] is a binary star[3] system in the northern constellation of Auriga. The combined apparent visual magnitude of the system is 1.9,[4] making it the second-brightest member of the constellation after Capella. Using the parallax measurements made during the Hipparcos mission, the distance to this star system can be estimated as Шаблон:Convert, give or take a half-light-year margin of error.[5]
It is moving closer to the Sun, and in around one million years, Beta Aurigae will become the brightest star in the night sky.[6]
Nomenclature
β Aurigae is the star system's Bayer designation. The traditional name Menkalinan is derived from the Arabic منكب ذي العنان mankib ðī-l-‘inān "shoulder of the rein-holder". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[7] to catalog and standardize proper names for stars. The WGSN's first bulletin of July 2016[8] included a table of the first two batches of names approved by the WGSN; which included Menkalinan for this star.
It is known as 五車三 (the Third Star of the Five Chariots) in traditional Chinese astronomy.
Properties
Beta Aurigae is a binary star system, but it appears as a single star in the night sky. The two stars are metallic-lined subgiant stars belonging to the A-type stellar classification;[9] they have roughly the same mass and radius. A-type entities are hot stars that release a blue-white hued light; these two stars burn brighter and with more heat than the Sun, which is a G2-type main sequence star. The pair constitute an eclipsing spectroscopic binary; the combined apparent magnitude varies over a period of 3.96 days between +1.89 and +1.94, as every 47.5 hours one of the stars partially eclipses the other from Earth's perspective.[10] The two stars are designated Aa and Ab in modern catalogues,[11][12] but have also been referred to as components 1 and 2 or A and B.[13][14]
There is an 11th magnitude optical companion with a separation of Шаблон:Val as of 2011, but increasing. It is also an A-class subgiant, but is an unrelated background star.[11]
At an angular separation of Шаблон:Val along a position angle of 155° is a companion star that is 8.5 magnitudes fainter than the primary. It may be the source of the X-ray emission from the vicinity.[15] The Beta Aurigae system is believed to be a stream member of the Ursa Major Moving Group.[16] Шаблон:Clear left
See also
References
External links
- ↑ Шаблон:Cite book
- ↑ Шаблон:Cite web
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- ↑ Шаблон:Cite web
- ↑ Шаблон:Cite web
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- Английская Википедия
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- M-type main-sequence stars
- A-type subgiants
- Am stars
- Algol variables
- Triple star systems
- Ursa Major moving group
- Stars with proper names
- Auriga (constellation)
- Bayer objects
- Durchmusterung objects
- Flamsteed objects
- Henry Draper Catalogue objects
- Hipparcos objects
- Bright Star Catalogue objects
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