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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 Leonis ： ウィキペディア英語版 Epsilon Leonis Epsilon Leonis (ε Leo, ε Leonis) is the fifth brightest star in the constellation Leo, consistent with its Bayer designation Epsilon. The star has the traditional names Ras Elased (Australis), Asad Australis and Algenubi, all of which derive from the Arabic رأس الأسد الجنوبي ''rās al-’asad al-janūbī'', which means "the southern (star) of the lion's head"; ''australis'' is Latin for "southern". == Properties == Epsilon Leonis has a stellar classification of G1 II, with the luminosity class of II indicating that, at an age of ,〔 it has evolved into a bright giant. It is much larger and brighter than the Sun with a luminosity 288 times and a radius 21 times solar.〔 Consequently, its absolute magnitude is actually –1.49,〔 making it one of the more luminous stars in the constellation, significantly more than its alpha star, Regulus. Algenubi's apparent brightness, though, is only 2.98.〔 Given its distance of about , the star is more than 3 times the distance from the Sun than Regulus. At this distance, the visual magnitude of Epsilon Leonis is reduced by 0.03 as a result of extinction caused by intervening gas and dust.〔 Algenubi exhibits the characteristics of a Cepheid-like variable, changing by an amplitude of 0.3 magnitude every few days.〔〔 It has around four times the mass of the Sun and a projected rotational velocity of .〔 Based upon its iron abundance, the metallicity of this star's outer atmosphere is only around 52% of the Sun's. That is, the abundance of elements other than hydrogen and helium is about half that in the Sun.〔 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 Leonis」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.