论文标题
新的X射线探测已知的狼射线星
New X-ray detections of known Wolf-Rayet stars
论文作者
论文摘要
使用XMM-Newton，我们进行了一个专门的项目，以在18 WR+OB系统中搜索X射线明亮的风力碰撞。我们通过Swift和Chandra数据集补充了这些观察结果，可以研究两个其他系统。我们还改善了tess，Kepler和ASAS-SN数据，改进了这些系统，这些系统显示了光度变化。五个系统显示出非常微弱的X射线发射（$ \ log [l _ {\ rm x}/l _ {\ rm bol}] <-8 $）<-8 $）和三个微弱的一个（$ \ log [l _ {\ rm x}}/l _ {\ rm bol}] X射线明亮。在其他一些系统中，O-Star Companion的X射线不能被排除为X射线的真正来源（或大型贡献者）。在另外两种情况下，发射显得微弱，但观察结果是用WR遮盖了视线的WR，这可能会隐藏碰撞的风发射。然而，在其余六个系统中发现了碰撞风的明确证据（WR19、21、31、97、105、127）。在WR19中，甚至检测到尿液中的吸收和较大的排放量，这与对绝热碰撞的期望一致。
Using XMM-Newton, we undertook a dedicated project to search for X-ray bright wind-wind collisions in 18 WR+OB systems. We complemented these observations with Swift and Chandra datasets, allowing for the study of two additional systems. We also improved the ephemerides, for these systems displaying photometric changes, using TESS, Kepler, and ASAS-SN data. Five systems displayed a very faint X-ray emission ($\log [L_{\rm X}/L_{\rm BOL}]<-8$) and three a faint one ($\log [L_{\rm X}/L_{\rm BOL}]\sim-7$), incompatible with typical colliding wind emission: not all WR binaries are thus X-ray bright. In a few other systems, X-rays from the O-star companion cannot be excluded as being the true source of X-rays (or a large contributor). In two additional cases, the emission appears faint but the observations were taken with the WR wind obscuring the line-of-sight, which could hide a colliding wind emission. Clear evidence of colliding winds was however found in the remaining six systems (WR19, 21, 31, 97, 105, 127). In WR19, increased absorption and larger emission at periastron are even detected, in line with expectations of adiabatic collisions.
