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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 RW Cephei ： ウィキペディア英語版 RW Cephei RW Cephei is an orange hypergiant star in the constellation Cepheus. One of the largest stars known, RW Cephei is estimated at 1,636 solar radii, which is larger than the orbit of Jupiter. RW Cephei is also a semi-regular variable star of type SRd, meaning it is a slowly varying yellow giant or supergiant. Its surface is subject to pulsations in temperature and luminosity. Over the past 50 to 70 years it has varied from classes G8 to M0 with no discernible pattern. Despite the possibly variable spectral type, it has been listed as a spectral standard star for "K2 0-Ia". The distance to RW Cephei has been estimated on the basis of its spectroscopic luminosity and is assumed to be a member of the Cepheus OB1 association at 11,500 parsecs. This is an order of magnitude larger than the distance implied by the Hipparcos parallax, although the apparent diameter of the star is larger than the measured parallax and variable.〔 The temperature intermediate between the red supergiants and yellow hypergiants, and itself varying considerably, has led to it being variously considered as a red hypergiant or or yellow hypergiant. ==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「RW Cephei」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.