论文标题
光学对应于Swift J0243.6+6124
Optical counterpart to Swift J0243.6+6124
论文作者
论文摘要
Swift J0243.6+6124在2017年10月的一次巨型X射线爆发中发现。虽然X射线频段有许多研究，但对光学对应物的了解很少。我们已经对这个有趣来源的光学对应物进行了光谱和光度分析。我们发现与Swift J0243.6+6124的光学对应物为V = 12.9，O9.5Ve Star，位于$ \ sim5 $ kpc的距离。源方向的光学灭绝为$ a_v = 3.6 $ mag。 O-Type星的旋转速度为210 km S $^{ - 1} $。长期的光学变异性与巨型X射线爆发后BE Centellar磁盘的增长和随后的耗散一致。爆发期间，光学和X射线光度密切相关，这表明是一个共同的起源。我们没有检测到短期周期性变异性，这可能与恒星光电相关的非自由搏动有关。
Swift J0243.6+6124 was discovered during a giant X-ray outburst in October 2017. While there are numerous studies in the X-ray band, very little is known about the optical counterpart. We have performed an spectral and photometric analysis of the optical counterpart of this intriguing source. We find that the optical counterpart to Swift J0243.6+6124 is a V = 12.9, O9.5Ve star, located at a distance of $\sim5$ kpc. The optical extinction in the direction of the source is $A_V=3.6$ mag. The rotational velocity of the O-type star is 210 km s$^{-1}$. The long-term optical variability agrees with the growth and subsequent dissipation of the Be circumstellar disk after the giant X-ray outburst. The optical and X-ray luminosity are strongly correlated during the outburst, suggesting a common origin. We did not detect short-term periodic variability that could be associated with nonradial pulsations from the Be star photosphere.
