Enhanced winds and tidal streams in massive X-ray binaries
Enhanced winds and tidal streams in massive X-ray binaries
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DOI：
10.1086/169934
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发表时间：
1991-04
期刊：
影响因子：
--
通讯作者：
J. Blondin;I. Stevens;T. Kallman
中科院分区：
文献类型：
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作者：
J. Blondin;I. Stevens;T. Kallman
在大质量X射线双星系统中，由致密伴星的存在所产生的潮汐效应预计会引起来自早期型主星星的增强风流。在本文中，二维气体动力学模拟这样的流。结果表明，风增强是双星分离的敏感函数，并在主星接近其临界面时发展成潮流。对于典型的系统参数，科里奥利力使气流充分偏转，使其不会直接撞击致密伴星，而是从其后面经过。气流中的密度可以达到环境风密度的20 - 30倍，导致穿过潮汐流的X射线通量强烈衰减，提供了一个可能的解释增强吸收事件看到在后期阶段的X射线观测的大质量X射线双星系统，如船帆座X-1。与随时间变化的吸积尾流相反，潮汐流相对稳定，产生的吸收特征在不同轨道之间应保持不变。对于具有强潮汐流的系统，吸积风中的大的不对称性导致恒定符号的角动量的吸积，而对于没有流的系统，吸积角动量的符号可以改变。参考文献39篇。«少
The tidal effects created by the presence of a compact companion are expected to induce a stream of enhanced wind from the early-type primary star in massive X-ray binary systems. In this paper, two-dimensional gasdynamical simulations of such streams are presented. It is found that the wind enhancement is a sensitive function of the binary separation, and develops into a tidal stream as the primary approaches its critical surface. For typical system parameters, the Coriolis force deflects the stream sufficiently that it does not impact directly on the compact companion but passes behind it. The density in the stream can reach values of 20-30 times the ambient wind density, leading to strong attenuation of the X-ray flux that passes through the tidal stream, providing a possible explanation of the enhanced absorption events seen at later phases in the X-ray observations of massive X-ray binary systems such as Vela X-1. In contrast to the time-variable accretion wake, the tidal stream is relatively stationary, producing absorption features that should remain fixed from orbit to orbit. For systems with a strong tidal stream, the large asymmetry in the accreting wind results in the accretion of angular momentum of constant sign, as opposed tomore » systems without streams, where the sign of the accreted angular momentum can change. 39 refs.« less