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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 Epsilon Arietis ： ウィキペディア英語版 Epsilon Arietis Epsilon Arietis (ε Ari, ε Arietis) is the Bayer designation for a visual binary〔 star system in the northern constellation of Aries. It has a combined apparent visual magnitude of 4.63〔 and can be seen with the naked eye, although the two components are too close together to be resolved without a telescope. With an annual parallax shift of 9.81 mas,〔 the distance to this system can be estimated as , give or take a 30 light-year margin of error. The brighter member of this pair has an apparent magnitude of 5.2.〔 At an angular separation of from the brighter component, along a position angle of ,〔 is the magnitude 5.5 companion.〔 Both are A-type main sequence stars with a stellar classification of A2 Vs.〔 (The 's' suffix indicates that the absorption lines in the spectrum are distinctly narrow.) In the 2009 ''Catalogue of Ap, HgMn and Am stars'', the two stars have a classification of A3 Ti,〔 indicating they are Ap stars with an anomalous abundance of titanium. Within the measurement margin of error, their projected rotational velocities are deemed identical at 60 km/s.〔 ==Name== This star system, along with δ Ari, ζ Ari, π Ari, and ρ3 Ari, were Al Bīrūnī's Al Buṭain (ألبطين), the dual of ''Al Baṭn'', the Belly. According to the catalogue of stars in the ''Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars'', ''Al Buṭain'' were the title for five stars :δ Ari as ''Botein'', π Ari as ''Al Buṭain I'', ρ3 Ari as ''Al Buṭain II'', ε Ari as ''Al Buṭain III'' dan ζ Ari as ''Al Buṭain IV''〔(Jack W. Rhoads - ''Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars'', Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971 )〕 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「Epsilon Arietis」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.