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藍巨星

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由左至右:紅矮星、太陽、藍矮星和R136a1。R136 a1並不是已知體積最大的恆星,這個頭銜屬於史蒂文森2-18

藍巨星(Blue Giant)是恆星恆星光譜分類中的第III級,光譜型為O或B型,為巨星的其中一種。藍巨星擁有极高的亮度,絕對星等一般为-2至-5.5等,表面溫度10,000K-55,000K。蓝巨星通常具有相当大的质量,大多数蓝巨星质量在太阳的5到25倍之间,少数O型的蓝巨星质量会更高。蓝巨星具有非常高的亮度,通常蓝巨星的总辐射能量在太阳的800倍(B9.5III)到太阳的10万倍(O8III)之间,一些O2/O3型的蓝巨星亮度则高达太阳的150万倍。蓝巨星拥有较高的表面温度,导致蓝巨星的大小远远不如同光度的黄色/红色巨星。蓝巨星的直径通常在太阳的6-20倍之间。更大的则是蓝超巨星。

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藍巨星
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