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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Alpha Columbae ： ウィキペディア英語版 Alpha Columbae Alpha Columbae (α Columbae, α Col) is the Bayer designation for a third magnitude star in the southern constellation of Columba. It has the traditional name of Phact, which is derived from the Arabic term for "ring-necked dove". It has an apparent visual magnitude of 2.6,〔 making it the brightest member of Columba. Based upon parallax measurements made during the Hipparcos mission, Alpha Columbae is located at a distance of around .〔 == Properties == This is believed to be a solitary star,〔〔 although it has a faint optical companion at an angular separation of 13.5 arcseconds, making it a double star.〔 The stellar classification of Alpha Columbae is B7 IV,〔 with the luminosity class of IV indicating it has evolved into a subgiant star. The spectrum shows it to be a Be star surrounded by a hot gaseous disk, which is generating emission lines because of hydrogen recombination.〔 Like most if not all such stars, it is rotating rapidly with a projected rotational velocity of . The azimuthal equatorial velocity may be .〔 It is a suspected Gamma Cassiopeiae type (GCAS) variable star, with its apparent magnitude varying from 2.62m to 2.66m. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Alpha Columbae」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.