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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 Aquilae ： ウィキペディア英語版 Epsilon Aquilae Epsilon Aquilae (ε Aql, ε Aquilae) is the Bayer designation for a binary star in the equatorial constellation of Aquila. It has an apparent visual magnitude of 4.02〔 and is visible to the naked eye. Based upon an annual parallax of 21.05 mas,〔 Epsilon Aquilae lies at a distance of approximately from Earth. This is a spectroscopic binary system.〔 The pair orbit each other over a period of 1,271 days (3.5 years) with an eccentricity of 0.27.〔 It has the traditional name Deneb el Okab, from an Arabic term ذنب العقاب ''ðanab al-cuqāb'' meaning "the tail of the eagle", and the Mandarin names Woo and Yuë, derived from and represent the state Wu (吳), an old state was located at the mouth of the Yangtze River, and Yue (越), an old state in Zhejiang province〔 (English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name ), Hong Kong Space Museum. Accessed on line November 23, 2010.〕 (together with 19 Capricorni in ''Twelve States'' asterism). According to the R.H. Allen's works, it shares names with ζ Aquilae.〔(Star Names - R.H.Allen p.61 )〕 Epsilon Aquilae is more precisely called ''Deneb el Okab Borealis'', because is situated to the north of Zeta Aquilae, which can therefore be called ''Deneb el Okab Australis''. The primary component of this system is an evolved giant star with a stellar classification of K1 III.〔 It has more than double〔 the mass of the Sun and has expanded to ten〔 times the Sun's radius. It shines with 54–fold the Sun's luminosity, which is being radiated from its outer envelope at an effective temperature of 4,760 K.〔 At this heat, it glows with the orange-hue of a K-type star.〔 This has been designated a barium star, meaning its atmosphere is extremely enriched with barium and other heavy elements. However, this is disputed, with astronomer Andrew McWilliam (1990) finding normal abundances from an s-process.〔 == 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「Epsilon Aquilae」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.