Английская Википедия:Gamma Trianguli
Шаблон:Short description Шаблон:Starbox begin Шаблон:Starbox image Шаблон:Starbox observe Шаблон:Starbox character Шаблон:Starbox astrometry Шаблон:Starbox detail Шаблон:Starbox catalog Шаблон:Starbox reference Шаблон:Starbox end Gamma Trianguli (Gamma Tri, γ Trianguli, γ Tri) is a star in the constellation Triangulum located approximately 112 light years from Earth. It has an apparent magnitude of +4.01 and forms an optical (line-of-sight) triple with Delta Trianguli and 7 Trianguli.[1]
Properties
This star has a stellar classification of A1Vnn,[2] which indicates it is an A-type main sequence star. It has 2.7[3] times the mass of the Sun and nearly double the Sun's radius.[4] Gamma Trianguli is radiating about 33[3] times the luminosity of the Sun from its outer envelope at an effective temperature of 9,440 K,[5] giving the star a white hue.[6] The star is roughly 300 million years old.[3]
Rotation
It is rotating rapidly, with a projected rotational velocity of 254 km/s along the equator,[7] which causes the star to take the pronounced shape of an oblate spheroid like Altair.[1] Because the inclination of the star's axial tilt is unknown, this means that the azimuthal equatorial velocity is at least this amount and possibly higher.[7] By comparison, the Sun is a slow rotator with an equatorial azimuthal velocity of 2 km/s.[8] The doppler shift from the rapid rotation results in very diffuse absorption lines in the star's spectrum, as indicated by the 'nn' in the classification.[9]
Debris disk
Orbiting the star is a dusty debris disk with a combined mass of about Шаблон:Nowrap times the mass of the Earth. This disk can be detected because it is being heated to a temperature of about 75 K by Gamma Trianguli and is radiating this as infrared energy. The disk is separated from the host star by an angle of 2.24 arcseconds, corresponding to a physical radius of 80 AU, or 80 times the separation of the Earth from the Sun.[4]
Naming
In Chinese, Шаблон:Lang (Шаблон:Lang), meaning Heaven's Great General, refers to an asterism consisting of γ Trianguli, γ Andromedae, φ Persei, 51 Andromedae, 49 Andromedae, χ Andromedae, υ Andromedae, τ Andromedae, 56 Andromedae, β Trianguli, and δ Trianguli. Consequently, the Chinese name for γ Trianguli itself is Шаблон:Lang (Шаблон:Lang, Шаблон:Lang-en.).[10]
References
- ↑ 1,0 1,1 Ошибка цитирования Неверный тег
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не указан текст - ↑ Шаблон:In lang AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 10 日
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