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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 Sigma Arae ： ウィキペディア英語版 Sigma Arae Sigma Arae (σ Ara, σ Arae) is the Bayer designation for a star in the southern constellation of Ara. It is visible to the naked eye with an apparent visual magnitude of +4.575.〔 The distance to this star, based upon an annual parallax shift of 8.62 mas,〔 is around . This is an A-type main sequence star with a stellar classification of A0 V.〔 Unusually for an A-type star, X-ray emissions with a luminosity of have been detected from Sigma Arae. Normally this is explained by the presence of a lower mass orbiting companion star. However, such a scenario does not appear to hold true for this star. Instead, the signature of a surface magnetic field has been detected with a strength of roughly , indicating the source of the X-rays may be surface magnetic activity.〔 ==References== 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「Sigma Arae」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.