Abstract
The cataclysmic variable star AE Aqr pulsates coherently on a period of 33.08 s at both optical and X-ray wavelengths. The pulses, which originate from the rotation of an accreting, magnetic white dwarf, show a variable delay in their time of arrival as the binary rotates. Reprocessing of extreme ultraviolet and X-ray radiation off a target fixed in the rotating frame of the binary has been suggested to explain the delays, which, as recent observations show, cannot be simply ascribed to the orbital motion of the white dwarf. If this is so, the pulsations occur on the beat period between the white dwarf's spin period and the binary's orbital period
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