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circumstellar envelope : ウィキペディア英語版 | circumstellar envelope The circumstellar envelope is the part of the star which has a roughly spherical shape and is not gravitationally bound to the star core. Usually circumstellar envelopes are formed from the dense stellar wind, or they are present before the formation of the star. Circumstellar envelopes of the old stars (Mira variables and OH/IR stars) eventually evolve into protoplanetary nebulae, and circumstellar envelopes of the young stellar objects evolve into circumstellar discs. == Types of circumstellar envelopes ==
* Circumstellar envelopes of AGB stars * Circumstellar envelopes around young stellar objects
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「circumstellar envelope」の詳細全文を読む
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