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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 Cygni ： ウィキペディア英語版 Sigma Cygni Sigma Cygni (σ Cyg) is a star in the constellation Cygnus. Its apparent magnitude is 4.21. It is a blue supergiant. It belongs to Cygnus OB4 association and is located approximantly 1 kpc away from Earth and has estimated absolute magnitude -6.1. Because of its location at the galactic disk, it is obstructed by interstellar dust. Because the degree of dimming caused by the interstellar isn't known, luminicity values are uncertain. Conservative estimates give luminocity 26,500 L☉ and radius 43 R☉ (about 0.2 AU). The star is estimated based on these estimatates that it is 15-20 million years old and that originally it was 10-12 solar masses, and thus probably is a supernova progenitor.〔Jim Kaler (9/03/2010) (Sigma and V1334 Cygni ) (accessed 21 May 2015)〕 Spectral analysis of the star showed that photospheric Si ii and He i lines display a simultaneous, periodic variability. The periodicity was calculated at 1.59 hours in all three lines and it might by reasult of stellar oscillations. ==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 Cygni」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.