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Words near each other
・ OAZ2
・ Oazu Nantoi
・ Oaș
・ Oaș Country
・ Oaș Mountains
・ Oașa Dam
・ Oașa Mică River
・ OB
・ Ob Bay
・ OB Flat
・ OB I bajnokság
・ OB I/B. bajnokság
・ Ob Jezeru City Stadium
・ OB marker
・ Ob River
OB star
・ OB Süd
・ OB West
・ Ob' Bay
・ Ob' Passage
・ Ob(Servant)
・ Ob, Russia
・ Ob-La-Di, Ob-La-Da
・ Ob-Ugric languages
・ Ob/ob mouse
・ OB10
・ OBA
・ Oba (Orisha)
・ Oba (ruler)
・ Oba Carr


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OB star : ウィキペディア英語版
OB star

OB stars are hot, massive stars of spectral types O or early-type B that form in loosely organized groups called OB associations. They are short lived, and thus do not move very far from where they formed within their life. During their lifetime, they will emit much ultraviolet radiation. This radiation rapidly ionizes the surrounding interstellar gas of the giant molecular cloud, forming an H II region or Strömgren sphere.
In lists of spectra the ''"spectrum of OB"'' refers to ''"unknown, but belonging to an OB association so thus of early type"''.
== See also ==

* Stellar kinematics

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「OB star」の詳細全文を読む



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