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arXiv 2104.02305astro-ph.HEastro-ph.SR
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天鹅座X-3中X射线对风的抑制

Wind suppression by X-rays in Cygnus X-3

Osmi Vilhu, Timothy R. Kallman, Karri I. Koljonen, Diana C. Hannikainen

摘要:

在风馈X射线双星中,主星的辐射驱动风可以被致密次星的X射线辐射所抑制。这导致了风和致密恒星的X射线光度之间的反馈。我们估计了供体星正面的风速如何取决于高质量X射线联星天鹅座X-3的光谱状态。我们模拟了超音速部分的风计算线力(力乘数)与卡斯特,雅培和克莱因形式主义和XSTAR物理,并通过解决质量守恒和动量平衡方程。我们计算了在风中的局部线力,同时考虑了施主星和致密星在每个谱态下的辐射场。在不同的轨道角度下,考虑到风聚集的影响,对风方程进行了求解。风引起的吸积光度估计使用邦迪-霍伊尔-利特尔顿形式主义和计算的风速在紧凑的恒星。我们发现,在假设中度风聚集和致密恒星质量较低的情况下,根据天鹅座X-3每个光谱状态的观测结果估计的光度与计算出的吸积光度之间存在相关性。对于强风聚集,这种相关性消失。我们发现,软X射线(EUV)从紧凑的恒星穿透风从施主星,减少线力,从而风速的正面。这增加了计算的吸积光度定性在一个类似的方式观察到的天鹅座X-3的光谱演化为一个中等的聚集体积填充因子和一个紧凑的恒星质量的几个(2 - 3)太阳质量。

英文摘要:

The radiatively driven wind of the primary star in wind-fed X-ray binaries can be suppressed by the X-ray irradiation of the compact secondary star. This causes feedback between the wind and the X-ray luminosity of the compact star. We estimated how the wind velocity on the face-on side of the donor star depends on the spectral state of the high-mass X-ray binary Cygnus X-3. We modeled the supersonic part of the wind by computing the line force (force multiplier) with the Castor, Abbott and Klein formalism and XSTAR physics and by solving the mass conservation and momentum balance equations. We computed the line force locally in the wind considering the radiation fields from both the donor and the compact star in each spectral state. The wind equations were solved at different orbital angles from the line joining the stars and taking the effect of wind clumping into account. Wind-induced accretion luminosities were estimated using the Bondi-Hoyle-Lyttleton formalism and computed wind velocities at the compact star. We found a correlation between the luminosities estimated from the observations for each spectral state of Cyg X-3 and the computed accretion luminosities assuming moderate wind clumping and a low mass of the compact star. For high wind clumping this correlation disappears. We show that soft X-rays (EUV) from the compact star penetrate the wind from the donor star and diminish the line force and consequently the wind velocity on the face-on side. This increases the computed accretion luminosities qualitatively in a similar manner as observed in the spectral evolution of Cyg X-3 for a moderate clumping volume filling factor and a compact star mass of a few (2 - 3) solar masses.

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