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HD 15558
HD 15558 (HIP 11832) is a massive O-type binary in the constellation of Cassiopeia. It is located in the Heart Nebula in open cluster IC 1805. The primary star is a very massive star with and . ==Physical characteristics== HD 15558 A is a massive O4.5 giant star with a surface temperature over 46,800 K. It has a mass of 152 and a luminosity of 660,000 . The star loses 1.5×10−5 per year.〔 HD 15558A may itself be a double star, suggested by the improbably large mass found from the binary orbit when compared to the other stellar parameters.〔 HD 15558 B is a classified O7V star. It has a mass of 46 .
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「HD 15558」の詳細全文を読む
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