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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 25 Orionis ： ウィキペディア英語版 25 Orionis 25 Orionis, less commonly known by its Bayer designation Psi1 Orionis (Ψ1 Orionis, Ψ1 Ori) is a fifth-magnitude star in the constellation Orion. Its kinematics place it among a dense cluster of almost 200 low-mass pre-main-sequence stars in the Orion OB1a subassociation known as the 25 Orionis group. == Properties == Like the star Pleione in the Pleiades open cluster, 25 Ori is a Be star with a gaseous circumstellar disk. The SIMBAD astronomical database lists its spectral class as B1Vpe.〔 The suffix "pe" refers to ''"Emission lines with peculiarity"'', a classification typical of many Be stars whose peculiar emissions come from the gaseous equatorial disks formed of material ejected from the star. 25 Orionis is a fast rotator, clocking a rotational velocity of 316 km/s, significantly faster than Achernar's speed of 251 km/s in the constellation Eridanus.〔 Having a radius of , the star rotates on its axis roughly once every 23 hours. With a mass in excess of , the star is expected to explode as a supernova.〔 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「25 Orionis」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.