Deceleration of the disk by the accreting magnetized star in the corotation approximation

N.R. Ikhsanov, N.G. Beskrovnaya
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Abstract

We study the process of interaction of an accretion disk with the dipole magnetic field of an accreting star within the corotation approximation. Using dynamical accretion picture we calculate the radius at which the gaseous pressure in the disk is balanced by the pressure of the dipole magnetic field of the accreting star and simultaneously the mass accretion rate in the disk is balanced by the rate of plasma diffusion into the stellar magnetic field. We show that the magnetospheric radius calculated under these conditions in a wide range of parameters is significantly smaller than the canonical Alfvén radius realized in the process of spherical accretion.
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在自转近似中,吸积磁化恒星对圆盘的减速
我们研究了吸积盘与吸积星的偶极磁场在旋转近似下的相互作用过程。利用动态吸积图,我们计算了吸积星的偶极磁场压力平衡圆盘内气体压力的半径,同时计算了吸积星的质量吸积率与等离子体扩散到恒星磁场的速度平衡的半径。结果表明,在这些条件下,在宽参数范围内计算的磁层半径明显小于球形吸积过程中实现的标准alfvsamn半径。
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