Abstract
Cyclical variations of orbital periods, quiescent magnitudes and outburst intervals in the activity of cataclysmic variable binary stars are inter-related and are ascribed to variations in radii of the secondaries, caused by solar-type (sunspot) magnetic cycles. In the nova remnant DQ Herculis the observed variations in orbital period and quiescent magnitude are consistent with this mechanism. But accretion onto the white dwarf, from an accretion disk acquired from its companion, cannot explain the observed variation of the 71-second oscillations.
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Warner, B. Quasiperiodicity in cataclysmic variable stars caused by solar-type magnetic cycles. Nature 336, 129–134 (1988). https://doi.org/10.1038/336129a0
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DOI: https://doi.org/10.1038/336129a0
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