高质量X射线双星中恒星风驱动的角动量去除和X射线电离效应
Wind-driven angular momentum removal and X-ray ionization effects in Roche-lobe overflowing HMXBs
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中文总结 AI 辅助
研究高质量X射线双星中恒星风与RLO流的动力学相互作用，用三维SPH模拟，发现无X射线电离时风影响吸积流，有电离时系统响应非单调，中等电离更具破坏性，为调节吸积流提供新机制。
中文摘要 AI 辅助
我们使用三维光滑粒子流体动力学（SPH）模拟研究了高质量X射线双星中恒星风与洛希瓣溢流（RLO）流之间的动力学相互作用。结果表明，供体风可对吸积流产生强大的动力学影响。在没有X射线电离时，风与盘不对称相互作用并携带逆行角动量，导致角动量净去除和盘尺寸减小。当考虑X射线光电离时，系统响应变得强烈非单调。高光度下，风加速受抑制，流接近无风情况；中等光度下，系统进入性质不同的吸积状态，部分电离风变得密集且动力学上重要，强烈扰动RLO流，吸积流从RLO主导转变为风主导，RLO流经历动力学分叉，导致盘形成受抑制。这些结果表明中等电离比弱电离和强电离更具破坏性，为调节RLO HMXBs中的吸积流提供了新机制。
英文摘要
We investigate the dynamical interaction between stellar winds and Roche-lobe overflow (RLO) streams in high-mass X-ray binaries using three-dimensional SPH simulations. We show that the donor wind can exert a strong dynamical influence on the accretion flow. In the absence of X-ray ionization, the wind interacts asymmetrically with the disk and carries retrograde angular momentum, resulting in a net removal of angular momentum and a reduction of the disk size. When X-ray photoionization is included, the response of the system becomes strongly non-monotonic. At high luminosity ($L_X = 10^{38} {\rm erg s}^{-1}$), wind acceleration is suppressed and the flow approaches the no-wind case. In contrast, at moderate luminosity ($L_X = 10^{37} {\rm erg s}^{-1}$), the system enters a qualitatively different accretion regime. In this regime, the partially ionized wind becomes dense and dynamically important, strongly perturbing the RLO stream. As a result, the accretion flow transitions from RLO-dominated to wind-dominated, and the RLO stream undergoes a dynamical bifurcation into low- and high-angular-momentum branches. This leads to suppressed disk formation despite the presence of a strong mass supply. These results demonstrate that moderate ionization can be more disruptive than both weak and strong ionization, providing a new mechanism regulating accretion flows in RLO HMXBs.
