Magnetic-field structure in the accretion disks of semi-detached binary systems |
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Authors: | A G Zhilkin D V Bisikalo |
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Institution: | 1.Institute of Astronomy,Russian Academy of Sciences,Moscow,Russia;2.Chelyabinsk State University,Chelyabinsk,Russia |
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Abstract: | The results of three-dimensional MHD numerical simulations are used to investigate the characteristic properties of the magnetic-field
structures in the accretion disks of semi-detached binary systems. It is assumed that the intrinsic magnetic field of the
accretor star is dipolar. Turbulent diffusion of the magnetic field in the disk is taken into account. The SS Cyg system is
considered as an example. The results of the numerical simulations show the intense generation of a predominantly toroidal
magnetic field in the accretion disk. Magnetic zones with well defined structures for the toroidal magnetic field form in
the disk, which are separated by current sheets in which there ismagnetic reconnection and current dissipation. Possible observational
manifestations of such structures are discussed. It is shown that the interaction of a spiral precessional wave with the accretor’s
magnetosphere could lead to quasi-periodic oscillations of the accretion rate. |
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Keywords: | |
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