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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 NGC 2346 ： ウィキペディア英語版 NGC 2346 NGC 2346 (also known as the Butterfly Nebula) is a planetary nebula near the celestial equator in the Monoceros constellation.〔(APOD: 28 October 2001 – NGC 2346: A Butterfly-Shaped Planetary Nebula )〕 It is bright and conspicuous and has been extensively studied. Among its most remarkable characteristics is its unusually cool central star, which is a spectroscopic binary, and its unusual shape. The binary star, which has a period of about 16 days, is also variable, probably due to dust in orbit around it. The dust itself is heated by the central star and so NGC 2346 is unusually bright in the infrared part of the spectrum. When one of the two stars evolved into a red giant, it engulfed its companion, which stripped away a ring of material from the larger star’s atmosphere. When the red giant’s core was exposed, a fast stellar wind inflated two ‘bubbles’ from either side of the ring. ==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「NGC 2346」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.