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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 IC 348 ： ウィキペディア英語版 IC 348 IC 348 is a star forming region in the constellation Perseus located about 315 parsecs from the Sun. It consists of nebulosity and an associated 2-million-year-old cluster of roughly 400 stars within an angular diameter of 20″. The most massive stars in the cluster are the binary star system BD+31°643, which has a combined spectral class of B5.〔 Based upon infrared observations using the Spitzer Space Telescope, about half of the stars in the cluster have a circumstellar disk, of which 60% are thick or primordial disks.〔 The age of this cluster has allowed three low mass brown dwarfs to be discovered. These objects lose heat as they age, so they are more readily discovered while they are still young.〔 ==References== 〕 〔cite news | title=Astronomers Discover Youngest And Lowest Mass Dwarfs In Solar Neighborhood | work=Science Daily | date=April 24, 2009 | url=http://www.sciencedaily.com/releases/2009/04/090422085801.htm | accessdate=2011-04-04 }}〕 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「IC 348」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.