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Chi Andromedae
Chi Andromedae ( Andromedae, And) is the Bayer designation for a star in the northern constellation of Andromeda. It has an apparent visual magnitude of +5.2,〔 which is relatively faint for a naked-eye star. Based upon parallax measurements made during the Hipparcos mission, Chi Andromedae is located around from Earth.〔
It with φ And composed the Chinese asterism 軍南門 (''Keun Nan Mun'', Mandarin ''jūnnánmén)'', "the South Gate of the Camp".〔 χ Andromedae is a member of (), meaning ''Heaven's Great General'', together with γ Andromedae, φ Persei, 51 Andromedae, 49 Andromedae, θ Andromedae, τ Andromedae, 56 Andromedae, β Trianguli, γ Trianguli and δ Trianguli. Consequently, χ Andromedae itself is known as (, (英語:the Fifth Star of Heaven's Great General).)〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 10 日 )〕
This is most likely a spectroscopic binary system with an estimated orbital period of 21.5 years and an eccentricity of 0.37. The primary component has a stellar classification of G8 III,〔 which indicates it is a giant star that has exhausted the supply of hydrogen at its core and evolved away from the main sequence. The outer envelope has expanded to about nine times the radius of the Sun and it is radiating 47〔 times the luminosity of the Sun at an effective temperature of 5,070 K.〔 This heat gives the star the yellow-hued glow of a G-type star.〔 It appears to be rotating very slowly with no measurable projected rotational velocity.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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