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Nu Cephei
Nu Cephei is a Class A2, fourth-magnitude star in the constellation Cepheus. Nu Cephei is a white pulsating variable star and multiple star system, located about 7000 light-years from Earth. It is some 25 times as massive as the Sun. Only around 5 to 6 million years old, it has exhausted its core hydrogen fuel and swollen into a white supergiant.〔 Hohle and colleagues, using the parallax, extinction and analysis of spectrum, came up with a mass 23.64 ± 5.57 times that and luminosity 254,181 times that of the Sun.〔 == 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「Nu Cephei」の詳細全文を読む
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