WRAY 977（GX301-2）：A HYPERGIANT WITH PULSAR COMPANION
WRAY 977 (GX301-2): A HYPERGIANT WITH PULSAR COMPANION
摘要：
射线977是X射线脉冲星GX 301 -2的B超巨星伴星，根据它的光谱与银河系最亮的恒星之一、著名的B超巨星Zeta 1 Sco的光谱的比较，它应该被分类为B1~Ia+。Wray 977被归类为超巨星，这导致了双星系统的新距离测定，即5.3 kpc（以前为1.8 +/- 0.4 kpc）。脉冲星的"平均“X射线光度约为10^37 erg/s，这与预测的X射线光度非常吻合，该光度是由致密的低速（v_infty = 400 km/s）恒星风吸积产生的。根据H α剖面，估计质量损失率为<= 10^-5 M_sun/yr。一个新的上限的倾斜系统的推导提供了一个下限的（目前）的质量Wray 977（48 M_太阳）。关于目前的双星演化方案，黑洞形成的经验下限增加到M_zams >= 50 M_sun。
英文摘要：
Wray 977, the B supergiant companion of the X-ray pulsar GX301-2, should be classified as B1~Ia+, based on a comparison of its optical spectrum to that of zeta1 Sco, a well-known B hypergiant and ONE OF THE BRIGHTEST STARS IN THE GALAXY. The classification of Wray 977 as a hypergiant results in a new distance determination of the binary system, i.e. 5.3 kpc (previously 1.8 +/- 0.4 kpc). The ``average'' X-ray luminosity of the pulsar is then ~10^37 erg/s, in good agreement with the predicted X-ray luminosity resulting from accretion of a dense, low-velocity (v_infty = 400 km/s) stellar wind. A mass-loss rate of <= 10^-5 M_sun/yr is estimated from the Halpha profile. A new upper limit for the inclination of the system is derived which provides a lower limit to the (present) mass of Wray 977 (48 M_sun). Regarding current binary evolution scenarios, the empirical lower mass limit for BLACK-HOLE formation in a binary increases to M_zams >= 50 M_sun.
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