Features of the Flow Structure in the Vicinity of the Inner Lagrangian Point in Polars

Abstract

The structures of plasma flows in close binary systems whose accretors have strong intrinsic magnetic fields are studied. A close binary system with the parameters of a typical polar is considered. The results of three dimensional numerical simulations of the material flow from the donor into the accretor Roche lobe are presented. Special attention is given to the flow structure in the vicinity of the inner Lagrangian point, where the accretion flow is formed. The interaction of the accretion flow material from the envelope of the donor with the magnetic field of the accretor results in the formation of a hierarchical structure of the magnetosphere, because less dense areas of the accretion flow are captured by the magnetic field of the white dwarf earlier than more dense regions. Taking into account this kind of magnetosphere structure can affect analysis results and interpretation of the observations. * isakovapb@inasan.ru

Hot Spots Drift in Synchronous and Asynchronous Polars: Results of Three-Dimensional Numerical Simulation

“…This model is based on the equations system of modified magnetic hydrodynamics, which describes astrophysical flows under conditions of a strong external magnetic field. We have successfully applied this approach to modeling the flow structure for both polars and intermediate polars [5,[16][17][18][19][20][21][22][23][24][25][26][27][28].…”

A Possible Mechanism for the Radio Emission of Polars

“…Some observational data provide evidence in favor of the accretion flow in the shape of a curtain (see [3] for references). Numerical modeling of accretion in polars suggests that the flow can have a complex hierarchical structure [14].…”

“…1 we present results of 3D numerical modeling of the flow structure in a typical polar. Computations were performed in the framework of model described by [14], with a computational domain containing a 384 × 384 × 192 grid. The parameters of the binary system correspond to AM Her.…”