Journal Article

Short and long time-scale variability in magnetic cataclysmic variables: long-term monitoring of polars

Belinda Kalomeni

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 422, issue 2, pages 1601-1608
Published in print May 2012 | ISSN: 0035-8711
Published online April 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2012.20736.x
Short and long time-scale variability in magnetic cataclysmic variables: long-term monitoring of polars

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We present long-term observations of the magnetic cataclysmic variables AM Her, AN UMa, AR UMa, DP Leo and V1309 Ori. Analyses of both short- and long-period light variations are presented. For the first time, as far as we know, long-period variations of AN UMa and AR UMa have been studied and multiple frequencies obtained. Fourier analysis indicates 170-, 218- and 180-d variations for AM Her, AN UMa and AR UMa, respectively. These periodicities may be due to modulation of the mass-transfer rate resulting from magnetic cycles in the secondary stars. In addition, we collect the physical parameters of polars from the literature and estimate their mass-transfer rates and orbital period variation and give a rough estimation of the donor magnetic fields.

Keywords: binaries: general; stars: individual: AM Her; stars: individual: AN UMa; stars: individual: AR UMa; novae, cataclysmic variables

Journal Article.  3917 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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