Radio and infrared structure of the colliding-wind Wolf-Rayet system WR147
Radio and infrared structure of the colliding-wind Wolf-Rayet system WR147
复制标题
碰撞风沃尔夫拉叶系统 WR147 的无线电和红外结构
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
D. Gunawan
中科院分区：
文献类型：
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作者：
P. Williams;S. Dougherty;R. Davis;K. A. Hucht;M. Bode;D. Gunawan
本文介绍了X射线发光Wolf-Rayet系统WR147(AS 431)的新的高分辨率红外和射电图像。5-GHz无线电图像解决了这个双源的两个组成部分。与WN8星风有关的向南发射的一个分量为170 253 Ma，表明星风不是球对称的。第二个非热分量为0 00：6，位于WN8恒星以北，由东向西延伸至267毫秒。红外图像显示了WN8恒星的一个伴星的存在，它靠近非热射电源，但距离WN8恒星略远(60毫秒)。同伴是K3Mag。比WN8恒星暗，亮度为B0.5V恒星，亮度刚刚好到可以与WN8恒星碰撞的恒星风。在两颗恒星之间存在非热发射，并且更接近于较弱的风的发射，这是这种发射来自碰撞风的直接证据。X射线辐射的很大一部分也可以由风碰撞中的能量释放来解释。与WC型恒星(WR125、WR140和WR146)组成的三个系统的非热能UX的比较表明，非热能UX与WR风速有一定的相关性。
New, high-resolution infrared and radio images of the X-ray luminous Wolf-Rayet system WR147 (AS 431) are presented. The 5-GHz radio image resolves both components of this double source. The emission from one component, that to the South and associated with the wind of the WN8 star is 170 253 mas, indicating that the stellar wind is not spherically symmetric. The second, non-thermal component 0 00 :6 north of the WN8 star, is extended East-West to 267 mas. The infrared image reveals the presence of a companion to the WN8 star, close to the non-thermal radio source but slightly (60 mas) more distant from the WN8 star. The companion is K 3 mag. fainter than the WN8 star and has a luminosity of a B0.5V star, just suuciently luminous to possess a stellar wind capable of colliding with that of the WN8 star. The presence of the non-thermal emission between the two stars and much closer to that with the weaker wind is direct evidence for a colliding-wind origin for the emission. A signiicant portion of the X-ray emission can also be accounted for by the release of energy in the wind collision. Comparison of the non-thermal ux with those of the three systems incorporating WC type stars (WR125, WR140 and WR146) shows a correlation with velocity of the WR wind.