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The Spin Periods of Magnetic Cataclysmic Variables

Published online by Cambridge University Press:  12 April 2016

A. J. Norton ,
R. V. Somerscales  and
G. A. Wynn
A. J. Norton
Affiliation:
Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA, U.K.
R. V. Somerscales
Affiliation:
Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6AA, U.K.
G. A. Wynn
Affiliation:
Department of Physics and Astronomy, The University of Leicester, University Road, Leicester LE1 7RH, U.K.

Abstract

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We have used a model of magnetic accretion to investigate the rotational equilibria of magnetic cataclysmic variables (MCVs). This has enabled us to derive a set of equilibrium spin periods as a function of orbital period and magnetic moment which we use to estimate the magnetic moments of all known intermediate polars. We further show how these equilibrium spin periods relate to the polar synchronisation condition and use these results to calculate the theoretical histogram describing the distribution of magnetic CVs as a function of Pspin/Porb. We demonstrate that this is in remarkable agreement with the observed distribution assuming that the number of systems as a function of white dwarf magnetic moment is distributed according to .

Type
Part 4. Asynchronous Systems
Information
International Astronomical Union Colloquium , Volume 190: Magnetic Cataclysmic Variables , 2004 , pp. 216 - 229
Copyright
Copyright © Astronomical Society of the Pacific 2004

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