SELF-REGULATED SHOCKS IN MASSIVE STAR BINARY SYSTEMS
SELF-REGULATED SHOCKS IN MASSIVE STAR BINARY SYSTEMS
复制标题
大质量双星系统中的自调节激波
DOI：
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
S. A. Sim
中科院分区：
文献类型：
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作者：
E. Parkin;S. A. Sim;S. A. Sim
在早期大质量星星双星系统中，X射线亮激波是由辐射压力驱动的恒星风在谱线跃迁上的强烈碰撞引起的。我们研究的影响，从风-风碰撞冲击的辐射驱动的恒星风使用稳态模型，包括一个参数化的线力与X射线电离的依赖性的X射线。我们的主要结果是，X射线辐射的冲击抑制风的加速，并可能导致较低的预冲击速度，和相应的较低的冲击等离子体温度，但内在的X射线光度的冲击，LX，保持基本不变，除了在小的二元分离适度增加。由于来自冲击的电离X射线和风驱动之间的反馈回路，我们将这种情况称为自调节冲击。这种效应被发现，大大增加的范围内的二进制分离的风光球碰撞很可能发生在系统中的两个风的动量显着不同。此外，接近冲击波的X射线电离的过度水平完全抑制了线力，我们认为这可能会使辐射制动不那么有效。模型结果与观测结果的比较显示，合理的协议的日志（LX/Lbol）。包含自调节冲击改善了大致相等的风动量系统中kT值的匹配，但对于风动量不等的系统（如果被认为是风光球碰撞），存在系统性偏移。
In an early-type, massive star binary system, X-ray bright shocks result from the powerful collision of stellar winds driven by radiation pressure on spectral line transitions. We examine the influence of the X-rays from the wind–wind collision shocks on the radiative driving of the stellar winds using steady-state models that include a parameterized line force with X-ray ionization dependence. Our primary result is that X-ray radiation from the shocks inhibits wind acceleration and can lead to a lower pre-shock velocity, and a correspondingly lower shocked plasma temperature, yet the intrinsic X-ray luminosity of the shocks, LX, remains largely unaltered, with the exception of a modest increase at small binary separations. Due to the feedback loop between the ionizing X-rays from the shocks and the wind driving, we term this scenario as self-regulated shocks. This effect is found to greatly increase the range of binary separations at which a wind-photosphere collision is likely to occur in systems where the momenta of the two winds are significantly different. Furthermore, the excessive levels of X-ray ionization close to the shocks completely suppress the line force, and we suggest that this may render radiative braking less effective. Comparisons of model results against observations reveal reasonable agreement in terms of log (LX/Lbol). The inclusion of self-regulated shocks improves the match for kT values in roughly equal wind momenta systems, but there is a systematic offset for systems with unequal wind momenta (if considered to be a wind-photosphere collision).
影响因子：
56.9
作者：
H. Sana;S. D. Mink;A. D. Koter;N. Langer;C. Evans;M. Gieles;E. Gosset;R. Izzard;J. L. Bouquin-J.
通讯作者：
H. Sana;S. D. Mink;A. D. Koter;N. Langer;C. Evans;M. Gieles;E. Gosset;R. Izzard;J. L. Bouquin-J.
DOI：
10.1111/j.1365-2966.2012.21317.x
发表时间：
2012-05
影响因子：
4.8
作者：
R. Chini;V. Hoffmeister;A. Nasseri;O. Stahl;H. Zinnecker
通讯作者：
R. Chini;V. Hoffmeister;A. Nasseri;O. Stahl;H. Zinnecker