The hard X-ray light-curves of accreting magnetized white dwarfs

Astronomy and Astrophysics – Astronomy

Scientific paper

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Light Curve, Magnetic Stars, Stellar Mass Accretion, White Dwarf Stars, X Ray Astronomy, X Ray Stars, Astronomical Photometry, Brightness Temperature, Stellar Luminosity, Stellar Occultation, Stellar Radiation

Scientific paper

The authors point out that the hard (⪆3 keV) X-ray light-curves of accreting magnetic white dwarfs can be understood as due solely to occultations of the emission region by the white-dwarf body. The prevalence of quasi-sinusoidal hard X-ray light-curves amongst the intermediate polars probably implies that the emission regions occupy a large fraction (2f ⪆ 0.5) of the white-dwarf surface; for the AM Her stars the authors tentatively conclude that f ⪆ 10-3. They discuss the likely behaviour of the light-curve amplitude as the X-ray brightness changes, and show that optical emission directly from the polecaps may dominate the pulsed light in some intermediate polars.

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