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


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KALOMENİ B.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, cilt.422, ss.1601-1608, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 422 Konu: 2
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1111/j.1365-2966.2012.20736.x
  • Dergi Adı: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
  • Sayfa Sayıları: ss.1601-1608

Özet

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 ANUMa and ARUMa 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.