Quasiperiodicity in cataclysmic variable stars caused by solar-type magnetic cycles

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Accretion Disks, Cataclysmic Variables, Stellar Oscillations, Supernova Remnants, White Dwarf Stars, Long Term Effects, Mass Transfer, Stellar Magnetic Fields, Stellar Magnitude, Stellar Mass Accretion, Sunspots

Scientific paper

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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