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


  • Belinda Kalomeni

    Corresponding author
    1. Department of Astronomy and Space Sciences, University of Ege, 35100 İzmir, Turkey
    2. Department of Physics, İzmir Institute of Technology, 35430 İzmir, Turkey
    3. MIT Kavli Institute for Astrophysics and Space Research, 70 Vassar Street, Cambridge, MA 02139, USA
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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.