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Magnetic Field Evolution in Accreting White Dwarfs

Published online by Cambridge University Press:  12 April 2016

Andrew Cumming
Andrew Cumming*
Affiliation:
Hubble Fellow, UCO/Lick Observatory, University of California, Santa Cruz, CA 95064, USA

Abstract

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I discuss the effect of accretion on the magnetic field of an accreting white dwarf. Whereas the magnetic fields of isolated white dwarfs are not expected to change significantly with time, I show that if an accreting white dwarf increases in mass at a rate > 1–5 × 10−10MΘ yr–1, accretion overcomes ohmic diffusion and has a significant effect on the field structure. I discuss the implications of this result for observed systems. In particular, accretion induced field evolution may provide the missing evolutionary link between the strong field, slowly accreting AM Her systems and the weak field, more rapidly accreting intermediate polars.

Type
Part 2. Magnetic Fields
Information
International Astronomical Union Colloquium , Volume 190: Magnetic Cataclysmic Variables , 2004 , pp. 58 - 70
Copyright
Copyright © Astronomical Society of the Pacific 2004

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