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| Paper: |
Tilted Disk Formation in Intermediate Polars |
| Volume: |
488, 8th International Conference of Numerical Modeling of Space Plasma Flows (ASTRONUM 2013) |
| Page: |
51 |
| Authors: |
Bisikalo, D. V.; Zhilkin, A. G. |
| Abstract: |
Using the results of 3D MHD simulations we consider the process of accretion disk formation in typical intermediate polars where the axes of accretors' magnetic fields are inclined with respect to their rotation axes. We found that initial particle positions in the rarefied titled disk are solely governed by the magnetic field of the accreting star. Since the disk gradually gains mass, the tilted disk eventually becomes decoupled from the magnetic field. The tidal action of the donor star causes a retrograde precession of the disk and makes it twisted. Since the disk is tilted, the stream from the L1 point transports matter over and under the disk rim to the inner regions of the disk. Meanwhile the outer annuli of the tilted twisted disk become warped. We found that the main effects determining the lifetime of the tilted disk are the mass transfer rate in the system and viscosity. The simulation results and their theoretical analysis show that for the typical intermediate polars the lifetime of the tilted disk may be as much as thousands of the orbital periods. |
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