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arXiv 1010.4949astro-ph.SR
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磁场作用下密近双星系统中吸积盘的形成

Formation of Accretion Disks in Close-Binary Systems with Magnetic Fields

A. G. Zhilkin, D. V. Bisikalo

摘要:

我们建立了一个三维数值模型,并应用它来模拟半分离双星系统中的等离子体流动,该系统的吸积体具有很强的内禀磁场。该模型是基于这样的假设,即等离子体动力学是由缓慢的平均流,这形成了一个背景的MHD波的快速传播。描述物质慢运动的方程是通过对快速传播的脉动进行平均而得到的。数值模型包括湍流涡流中电流耗散引起的磁场扩散、磁浮力和波动MHD湍流。用一个改进的三维并行数值程序模拟了具有不同吸积体磁场(从$10^5$到$10^8$ G)的密近双星系统中的流场结构。讨论了吸积盘形成的条件和区分中间极和极两种流的判据。

英文摘要:

We have developed a three-dimensional numerical model and applied it to simulate plasma flows in semi-detached binary systems whose accretor possesses a strong intrinsic magnetic field. The model is based on the assumption that the plasma dynamics are determined by the slow mean flow, which forms a backdrop for the rapid propagation of MHD waves. The equations describing the slow motion of matter were obtained by averaging over rapidly propagating pulsations. The numerical model includes the diffusion of magnetic field by current dissipation in turbulent vortices, magnetic buoyancy, and wave MHD turbulence. A modified three-dimensional, parallel, numerical code was used to simulate the flow structure in close binary systems with various accretor magnetic fields, from $10^5$ to $10^8$ G. The conditions for the formation of the accretion disk and the criteria distinguishing the two types of flow corresponding to intermediate polars and polars are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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