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Features of the matter flows in the peculiar cataclysmic variable AE Aquarii

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Abstract

The structure ofmatter flows in close binary systems in which one of the components is a rapidly rotating magnetic white dwarf is studied. Themain example considered is the AEAquarii system; the period of the white dwarf’s rotation is about a factor of 1000 shorter than the orbital period, and the magnetic field on the white-dwarf surface is of order 50MG. The matter flows in this system were analyzed via numerical solution of a systemofmagnetohydrodynamical equatons. These computations show that the white dwarf’s magnetic field does not significantly influence the velocity field of the matter in its Roche lobe in the case of a laminar flow regime, so that the field does not hinder the formation of a transient disk (ring) surrounding the magnetosphere. However, the efficiency of the energy and angular-momentum exchange between the white dwarf and the surrounding matter increases considerably with the development of turbulent motions in the matter, accelerating the matter at the magnetosphere boundary and leading to a high escape rate from the system. The time scales for the system’s transition between the laminar and turbulent modes are close to those for the transition of AE Aquarii between its quiet and active phases.

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Authors and Affiliations

  1. Institute of Astronomy, Russian Academy of Sciences, ul. Pyatnitskaya 48, Moscow, 119017, Russia

    P. B. Isakova, A. G. Zhilkin & D. V. Bisikalo

  2. Central (Pulkovo) Astronomical Observatory, Russian Academy of Sciences, Pulkovskoe shosse 65, St. Petersburg, 196140, Russia

    N. R. Ikhsanov & N. G. Beskrovnaya

  3. St. Petersburg State University, Universitetskii pr. 28, Petrodvorets, 198504, Russia

    N. R. Ikhsanov

  4. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachai-Cherkessian Republic, 357147, Russia

    N. R. Ikhsanov

  5. Chelyabinsk State University, ul. Bratyev Kashirinykh 129, Chelyabinsk, 454001, Russia

    A. G. Zhilkin

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  1. P. B. Isakova
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  2. N. R. Ikhsanov
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  3. A. G. Zhilkin
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  4. D. V. Bisikalo
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  5. N. G. Beskrovnaya
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Correspondence to P. B. Isakova.

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Original Russian Text © P.B. Isakova, N.R. Ikhsanov, A.G. Zhilkin, D.V. Bisikalo, N.G. Beskrovnaya, 2016, published in Astronomicheskii Zhurnal, 2016, Vol. 93, No. 5, pp. 474–485.

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Isakova, P.B., Ikhsanov, N.R., Zhilkin, A.G. et al. Features of the matter flows in the peculiar cataclysmic variable AE Aquarii. Astron. Rep. 60, 498–508 (2016). https://doi.org/10.1134/S1063772916040065

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  • DOI: https://doi.org/10.1134/S1063772916040065

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