Features of the accretion in the EX Hydrae system: Results of numerical simulation


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Abstract

A two-dimensional numerical model in the axisymmetric approximation that describes the flow structure in the magnetosphere of the white dwarf in the EX Hya system has been developed. Results of simulations show that the accretion in EX Hya proceeds via accretion columns, which are not closed and have curtain-like shapes. The thickness of the accretion curtains depends only weakly on the thickness of the accretion disk. This thickness developed in the simulations does not agree with observations. It is concluded that the main reason for the formation of thick accretion curtains in the model is the assumption that the magnetic field penetrates fully into the plasma of the disk. An analysis based on simple estimates shows that a diamagnetic disk that fully or partially shields the magnetic field of the star may be a more attractive explanation for the observed features of the accretion in EX Hya.

About the authors

P. B. Isakova

Institute of Astronomy

Author for correspondence.
Email: isakovapb@inasan.ru
Russian Federation, ul. Pyatnitskaya 48, Moscow, 119017

A. G. Zhilkin

Institute of Astronomy

Email: isakovapb@inasan.ru
Russian Federation, ul. Pyatnitskaya 48, Moscow, 119017

D. V. Bisikalo

Institute of Astronomy

Email: isakovapb@inasan.ru
Russian Federation, ul. Pyatnitskaya 48, Moscow, 119017

A. N. Semena

Space Research Institute

Email: isakovapb@inasan.ru
Russian Federation, ul. Profsoyuznaya 84/32, Moscow, 117997

M. G. Revnivtsev

Space Research Institute

Email: isakovapb@inasan.ru
Russian Federation, ul. Profsoyuznaya 84/32, Moscow, 117997

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