论文标题
WRAY 15-906：候选发光蓝色变量，用明智，赫歇尔和盐发现
Wray 15-906: a candidate luminous blue variable discovered with WISE, Herschel and SALT
论文作者
论文摘要
我们介绍了银河候选发光蓝色可变wray的研究结果，15-906，该研究通过与宽场红外调查探险家和赫斯切尔空间观测站发现其红外壳外壳（直径为\ of 2 pc）。使用恒星大气代码CMFGEN和GAIA视差，我们发现Wray 15-906是相对较低的luminosity，log（l/lsun）\大约5.4，温度为25 \ pm2 kk的星星，具有质量 - 流量的质量 - 质量为\ times10^{ - 5} msun/yr/yr and yr and yr and yr seforment，and y yr and y seforcy and wind0000 f。丰度为65 \ pm2％（按质量）。在单星进化的框架中，获得的结果表明WRAY 15-906是红色后的超级恒星，初始质量为\ oft26 \ pm2 msun，并且在作为超新星爆炸之前，它可以短时间转换为WN11H恒星。我们对南部非洲大型望远镜（SALT）进行的光谱监测并未揭示在最后8年中WRAY 15-906的光谱发生重大变化，而1999--2019年，该星的V波段光线曲线显示出Quasi-Periodicic的变化，\ of \ over \ of ^ bepliodicics \ of \ over \ of complutife of of osplifity \ of osplutife of of of compliture大约\ oble clitude \ ofer clipter \ collitus \ actim \ of cout0.1 mag。我们估计壳的质量为2.9 \ pm0.5 msun，假设气体与盘状质量比为200。这种壳的存在表明WRAY 15-906在最近的过去遭受了巨大的质量损失。我们发现，如果这颗恒星是二元进化的恢复活力的产物（蓝色的straggler），则开放的星团C1128-631可能是Wray 15-906的出生地。
We present the results of study of the Galactic candidate luminous blue variable Wray 15-906, revealed via detection of its infrared circumstellar shell (of \approx2 pc in diameter) with the Wide-field Infrared Survey Explorer and the Herschel Space Observatory. Using the stellar atmosphere code CMFGEN and the Gaia parallax, we found that Wray 15-906 is a relatively low-luminosity, log(L/Lsun)\approx5.4, star of temperature of 25\pm2 kK, with a mass-loss rate of \approx3\times10^{-5} Msun/yr, a wind velocity of 280\pm50 km/s, and a surface helium abundance of 65\pm2 per cent (by mass). In the framework of single star evolution, the obtained results suggest that Wray 15-906 is a post-red supergiant star with initial mass of \approx26\pm2 Msun and that before exploding as a supernova it could transform for a short time into a WN11h star. Our spectroscopic monitoring with the Southern African Large Telescope (SALT) does not reveal significant changes in the spectrum of Wray 15-906 during the last 8 yr, while the V-band light curve of this star over years 1999--2019 shows quasi-periodic variability with a period of \approx1700 d and an amplitude of \approx0.1 mag. We estimated the mass of the shell to be 2.9\pm0.5 Msun assuming the gas-to-dust mass ratio of 200. The presence of such a shell indicates that Wray 15-906 has suffered substantial mass loss in the recent past. We found that the open star cluster C1128-631 could be the birth place of Wray 15-906 provided that this star is a rejuvenated product of binary evolution (a blue straggler).
