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WR 102
WR 102 is a Wolf-Rayet star in the constellation Cygnus, an extremely rare star on the WO oxygen sequence. ==Features== WR 102, of spectral classification WO2, is one of the very few known oxygen-sequence Wolf-Rayet stars, just four in the Milky Way galaxy and five in external galaxies. It is also the hottest known with a surface temperature of 210,000 K. Modelling the atmosphere gives a luminosity around ,〔 while calculations from brightness and distance gives luminosity of nearly although the distance is not known with any certainty.〔 It is a very small dense star, with a radius less than 40% of the solar one but nearly 20 times more massive. Very strong stellar winds, with a terminal velocity of 5,000 kilometers per second are causing WR 102 to lose /year. For comparison, the Sun loses (2-3) x 10−14 solar masses per year due to its solar wind, several hundred million times less than WR 102.
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「WR 102」の詳細全文を読む
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