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9 Persei
9 Persei is a pulsating variable star in the constellation Perseus. Its apparent magnitude is 5.21. Located around distant, it is an blue supergiant of spectral type A2Ia, a massive star that has used up its core hydrogen and is now fusing heavier elements. ==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「9 Persei」の詳細全文を読む
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