Linear stability analysis of spherical accretion flows onto compact objects
Linear stability analysis of spherical accretion flows onto compact objects
复制标题
致密物体上球形吸积流的线性稳定性分析
DOI：
10.1086/171679
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发表时间：
1992
期刊：
影响因子：
--
通讯作者：
R. Chevalier
中科院分区：
文献类型：
--
作者：
J. Houck;R. Chevalier
在很宽的吸积率（AR）的各种冷却功能作为比热比（γ）的函数的范围内的稳态结构和线性稳定性的球形吸积流到紧凑的对象进行了研究。径向和非径向激波扰动。随着AR的减小，流动变得更加延伸。冷却功能对γ = 5/3的沉降溶液的扩展结构具有显著影响。相反，γ = 4/3的沉降解的扩展结构几乎与冷却函数的形式无关。对于伽玛= 4.3和伽玛= 5.3，径向冲击振荡的基本模式和第一泛音不稳定的球形扩展吸积信封。讨论了这些结果在超新星后中子星星吸积流和AM-Her天体光度振荡中的应用。
The steady state structure and linear stability of spherical accretion flows onto compact objects are investigated over a wide range of accretion rates (ARs) for a variety of cooling functions as a function of the ratio of specific heats (gamma). Both radial and nonradial shock perturbations are considered. The flows become more extended as AR decreases. The cooling function has a significant effect on the extended structure of settling solutions with gamma = 5/3. In contrast, the extended structure of settling solutions with gamma = 4/3 is nearly independent of the form of the cooling function. For both gamma = 4.3 and gamma = 5.3, radial shock oscillation in the fundamental and first overtone modes are destabilized in spherically extended accretion envelopes. The application of these results to postsupernova neutron star accretion flows and to luminosity oscillations in AM Her objects are discussed.