Английская Википедия:56 Persei
Шаблон:Short description Шаблон:Starbox begin Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end
56 Persei is at least a triple star[1] and possibly a quadruple star[2] system in the northern constellation of Perseus. It is visible to the naked eye as a dim point of light with a combined apparent visual magnitude of 5.77.[3] The system is located Шаблон:Convert distant from the Sun based on parallax,[4] but is drifting closer with a radial velocity of −32 km/s.[3]
The main component is a binary system[5] with an orbital period of 47.3 years and a semimajor axis of Шаблон:Val. The primary, designated component Aa, is an F-type main-sequence star with a stellar classification of F4V, a star that is currently fusing its core hydrogen.[6] It is 1.8[7] billion years old with 1.5[6] times the mass of the Sun and twice[4] the Sun's radius. It is radiating 7[7] times the luminosity of the Sun from its photosphere at an effective temperature of 6,629 K.[7]
The companion, component Ab, is a hydrogen–rich white dwarf star with a class of DA3.1,[2] having begun its main sequence life with more mass than the current primary and thus evolved into a compact star more rapidly. It now has 90% of the Sun's mass – much higher than the Шаблон:Val for an average white dwarf – and an effective temperature of 16,420 K;[1] contributing an ultraviolet excess to the system.[2]
Component B shares a common linear motion through space with the primary, and thus may form a third member of the system. This star has 0.84 times the mass of the Sun and a projected separation of Шаблон:Val from the primary.[6] The Washington Double Star Catalogue has it classified as a double star, with a magnitude 11.30 companion at an angular separation of Шаблон:Val along a position angle of 292°, as of 2002.[8]
References
- ↑ 1,0 1,1 Ошибка цитирования Неверный тег
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; для сносокLandsman1996
не указан текст - ↑ 2,0 2,1 2,2 Ошибка цитирования Неверный тег
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; для сносокHolberg2013
не указан текст - ↑ 3,0 3,1 Ошибка цитирования Неверный тег
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; для сносокAnderson2012
не указан текст - ↑ 4,0 4,1 Ошибка цитирования Неверный тег
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; для сносокGaiaDR2
не указан текст - ↑ Ошибка цитирования Неверный тег
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; для сносокEggleton2008
не указан текст - ↑ 6,0 6,1 6,2 Ошибка цитирования Неверный тег
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; для сносокTokovinin2015
не указан текст - ↑ 7,0 7,1 7,2 Ошибка цитирования Неверный тег
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; для сносокDavid2015
не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>
; для сносокWDSC2014
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- Английская Википедия
- F-type main-sequence stars
- White dwarfs
- Multiple star systems
- Perseus (constellation)
- Durchmusterung objects
- Flamsteed objects
- Henry Draper Catalogue objects
- Hipparcos objects
- Bright Star Catalogue objects
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