A possible scenario of the flaring activity in AE Aqr

The flow structure in magnetic cataclysmic variables with strong magnetic field and fast rotation of the white dwarf was investigated. We model the AE Aqr system as a representative observational object whose spin period of the white dwarf is about 1000 times shorter than the orbital period of the s...

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Bibliographic Details
Main Authors: Isakova, P. B., Zhilkin, A. G., Bisikalo, D. V., Ikhsanov, N. R.
Format: Conference Proceeding
Language:English
Subjects:
Ambipolar diffusion
Angular momentum
Cataclysmic variables
Computational fluid dynamics
Lagrangian equilibrium points
Laminar flow
Magnetic fields
Magnetospheres
Momentum transfer
Orbits
Rotation
Turbulence
Turbulent flow
White dwarf stars
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Summary:The flow structure in magnetic cataclysmic variables with strong magnetic field and fast rotation of the white dwarf was investigated. We model the AE Aqr system as a representative observational object whose spin period of the white dwarf is about 1000 times shorter than the orbital period of the system. Observations show that in spite of the fast rotation some part of the material from the inner Lagrangian point is present in the Roche lobe of the white dwarf. We analyze the possible physical mechanisms that can lead to the less effective angular momentum transfer from the rotating magnetosphere to the inflowing material. Among these mechanisms are the ambipolar diffusion, the pressure of the magneto-dipole radiation, the relativistic retard of magnetic field lines and the incomplete penetration of the magnetic field to plasma. Results of our analysis show that the last mechanism is the most effective. Taking this effect into account we can find the flow structure that is in an agreement with observations. The unique flaring activity is the most prominent property of the AE Aqr system. In this system, the active and quiescent phases alternate. The flaring activity may be caused by the transitions between the laminar and turbulent regimes. In the laminar regime, the flow goes around the star and collides with the material flowing from the inner Lagrangian point. As a result the shock occurs which produces the flow turbulence. In the turbulent regime, the magnetosphere pushes the material away from the Roche lobe of the white dwarf and the flow becomes quickly laminar again.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4942565