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arXiv 1702.00587astro-ph.SR
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食双星系统V1239 Her吸积盘的三维模拟

3D modelling of accretion disc in eclipsing binary system V1239 Her

V. V. Lukin, K. L. Malanchev, N. I. Shakura, K. A. Postnov, V. M. Chechetkin, V. P. Utrobin

摘要:

本文介绍了食矮新星V1239 Her静止吸积流的三维流体动力学模拟结果。该模型包括充满罗氏瓣的光学星、从二元系统内拉格朗日点发出的气流以及吸积盘结构。一股冷的氢气流最初被发射到一个点状的引力中心。在吸积开始后约15个轨道周期内形成一个静止的吸积盘。该模型考虑了氢的部分电离,并采用了真实的氢冷却函数。系统的光变曲线计算为光学薄层沿着视线直到光学深度τ=2/3的体积发射,使用普朗克平均不透明度计算。计算的日食光变曲线与观测结果吻合得很好,日食前和日食后光变曲线的形状变化完全可以解释为通过气流的质量吸积率变化约50%。

英文摘要:

We present the results of 3D-hydrodynamical simulations of accretion flow in the eclipsing dwarf nova V1239 Her in quiescence. The model includes the optical star filling its Roche lobe, a gas stream emanating from the inner Lagrangian point of the binary system, and the accretion disc structure. A cold hydrogen gas stream is initially emitted towards a point-like gravitational centre. A stationary accretion disc is formed in about 15 orbital periods after the beginning of accretion. The model takes into account partial ionization of hydrogen and uses realistic cooling function for hydrogen. The light curve of the system is calculated as the volume emission of optically thin layers along the line of sight up to the optical depth τ=2/3 calculated using Planck-averaged opacities. The calculated eclipse light curves show good agreement with observations, with the changing shape of pre-eclipse and post-eclipse light curves being explained entirely due to ~ 50% variations in the mass accretion rate through the gas stream.

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