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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 V509 Cassiopeiae ： ウィキペディア英語版 V509 Cassiopeiae V509 Cassiopeiae (V509 Cas or HR 8752) is a yellow hypergiant star in the constellation Cassiopeia. HR 8752 is around 4,500 light years from Earth. It has an apparent magnitude that has varied from below +6 in historical times to a peak of +4.6 and now around +5.3 and is classified as a semiregular variable star of type SRd. It is undergoing strong mass loss as part of its rapid evolution and has recently passed partway through the yellow evolutionary void by ejecting around a solar mass of material in 20 years.〔 A hot main sequence companion (B1V) was described in 1978 on the basis of a colour excess in the ultraviolet. ==Observations== 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「V509 Cassiopeiae」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.