Английская Википедия:6 Andromedae
Шаблон:Short description Шаблон:For Шаблон:Starbox begin Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox orbit Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end 6 Andromedae is an astrometric binary star[1] system in the northern constellation of Andromeda. The designation comes from the star catalogue of John Flamsteed, first published in 1712. Its apparent visual magnitude is 5.91,[2] which is just bright enough to be visible to the naked eye under good seeing conditions. Based upon an annual parallax shift of 34.1 mas as seen from Earth,[3] it is around 96 light years from the Sun. It is moving closer to the Sun with a radial velocity of −32.4 km/s.[2] The system has a relatively high proper motion, advancing across the celestial sphere at the rate of 0.272 arc seconds per annum.[4]
This is a single-lined spectroscopic binary with an orbital period of 9.2 years and an eccentricity of 0.3.[5] Some early observations of the star gave it a subgiant luminosity class and it was published in the Bright Star Catalogue as spectral class F5 IV. More modern measurements identify the visible component as an F-type main-sequence star with a stellar classification of F5 V.[5][6] The star is an estimated 2.9[7] billion years old with 1.3[7] times the mass of the Sun and 1.5[3] times the Sun's radius. It is radiating 3.1[3] times the Sun's luminosity from its photosphere at an effective temperature of around 6,425 K.[7] 6 Andromedae displays an infrared excess at a wavelength of 22 μm, which may indicate a circumstellar disk of warm dusty debris.[8]
The mass of the secondary component is roughly at or above that of the Sun. If it were a single, ordinary star, it should be readily visible as it would be just one magnitude fainter than the primary. The lack of conspicuous ultraviolet emission appears to rule out a white dwarf companion, so it may instead itself be a binary system consisting of two smaller stars having an orbital period between a week and a year.[5]
References
- ↑ Ошибка цитирования Неверный тег
<ref>; для сносокFrankowski2007не указан текст - ↑ 2,0 2,1 Ошибка цитирования Неверный тег
<ref>; для сносокAnderson2012не указан текст - ↑ 3,0 3,1 3,2 Ошибка цитирования Неверный тег
<ref>; для сносокGaiaDR2не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокLepine2005не указан текст - ↑ 5,0 5,1 5,2 Ошибка цитирования Неверный тег
<ref>; для сносокGriffin2012не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокskiffне указан текст - ↑ 7,0 7,1 7,2 Ошибка цитирования Неверный тег
<ref>; для сносокDavid2015не указан текст - ↑ Ошибка цитирования Неверный тег
<ref>; для сносокMizusaw2012не указан текст
- Английская Википедия
- F-type main-sequence stars
- Astrometric binaries
- Durchmusterung objects
- Andromeda (constellation)
- Flamsteed objects
- Henry Draper Catalogue objects
- Hipparcos objects
- Bright Star Catalogue objects
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- Википедия
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