Accretion in wind-driven X-ray sources
Accretion in wind-driven X-ray sources
复制标题
风驱动 X 射线源中的吸积
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
B. Fryxell
中科院分区：
文献类型：
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作者：
R. Taam;A. Fu;B. Fryxell
研究了恒星风馈源 X 射线源中轴对称吸积流的流体动力学，包括辐射引起的动量沉积，以及康普顿和轫致辐射过程的辐射加热和冷却。质量吸积率范围为爱丁顿值 0.02 到 0.4 的二维数值模拟结果揭示了多种行为。在低速率下，辐射效应并不重要，吸积流几乎是绝热的。在这种情况下，流量是稳定的。对于中等吸积率，辐射加热和冷却效应变得很重要。流量保持稳定，但吸积率与霍伊尔-利特尔顿估计相比显着降低。在最高的质量吸积率下，辐射动量转移和能量交换很重要，并会导致非稳态行为。对于与高速吸积的大规模 X 射线双星系统相关的参数，结果表明吸积流可能很复杂且依赖于时间。 45 参考文献
The hydrodynamics of axisymmetric accretion flow in stellar wind-fed X-ray sources is investigated, including momentum deposition by radiation, as well as radiative heating and cooling by Compton and bremsstrahlung processes. The results of two-dimensional numerical simulations for mass accretion rates ranging from 0.02 to 0.4 of the Eddington value reveal a variety of behaviors. At low rates radiative effects are unimportant, and the accretion flow is nearly adiabatic. In this case the flow is steady. For intermediate accretion rates, radiative heating and cooling effects become important. The flow remains steady, but the accretion rate is significantly reduced from the Hoyle-Lyttleton estimate. At the highest mass accretion rates, radiative momentum transfer and energy exchange are important and lead to nonsteady behavior. For the parameters relevant to massive X-ray binary systems accreting at high rates, the results reveal that the accretion flows can be complex and time dependent. 45 refs.