Structure of X-ray irradiated stellar wind
Structure of X-ray irradiated stellar wind
复制标题
X射线照射的恒星风的结构
DOI：
10.1007/bf00650363
复制
发表时间：
1984
影响因子：
1.9
通讯作者：
K. Masai
中科院分区：
文献类型：
--
作者：
K. Masai
研究了X射线辐照对X射线双星系统线驱动星风的影响。X射线光度Lx和风中密度的乘积是区分光学薄风区和光学厚风区的一个尺度。对于辐射温度为10 keV的X射线源，临界值（Lxn）c约为1037 erg s−1cm−3;因此，由于Lxn>（Lxn）c，大多数风馈X射线源处于光学厚风区。风的结构不仅由参数λ =（Lx/nR ~ 2），R与X射线源的距离决定，而且还由氦的光学厚度决定。完全电离氦区的形成依赖于Lxandin的方式不同于Strömgren球。在这样一个光学厚风，后面的区域的He II电离边界的影响不大，X射线照射和微量元素仍然是负责风加速。因此，它的位置对于风的结构和解释物体中的各种现象（如风馈X射线望远镜）非常重要。
The effect of X-ray irradiation on the line-driven stellar wind in X-ray binary systems is studied. The product of the X-ray luminosityLxand the densitynin the wind is a measure to distinguish between the optically thin and thick wind regimes. For an X-ray source of the radiation temperature of 10 keV, the critical value(Lxn)c, is of the order of 1037erg s−1cm−3; hence, most of wind-fed X-ray sources lie in the optically thick wind regime because ofLxn>(Lxn)c. Then the wind structure is determined not only by the parameter ζ=(Lx/nR2),Rthe distance from the X-ray source, but also by the optical thickness due to helium. The formation of fully ionized helium region depends onLxandnin a way different from that of the Strömgren sphere. In such an optically thick wind, the region behind the He II ionization boundary is little affected by X-ray irradiation and the trace elements remain to be responsible for wind acceleration. Thus, its location is important for the structure of the wind and the interpretation of various phenomena in objects such as wind-fed X-ray pulsars.