The origin of soft X-ray pulsations in dwarf novae at outburst and the DQ Herculis phenomenon

Astronomy and Astrophysics – Astrophysics

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Dwarf Novae, Stellar Oscillations, X Ray Sources, Astrophysics, Energy Transfer, Magnetic Effects, Periodic Variations, Stellar Models, White Dwarf Stars

Scientific paper

A natural explanation for the quasi-periodic oscillations seen in soft X-ray observations of dwarf novae at outburst is presented in terms of a recent model which suggests that soft X-ray production is controlled largely by transport processes into the white-dwarf body. A weak magnetic field anchored in the degenerate core of a white dwarf will produce coherent pulsing in soft but not in hard X-rays; this may be occurring in the DQ Her systems. If the fields are transient and generated by dynamo action in the white dwarf envelope, quasi-periodic quasi-coherent soft X-ray pulsations will naturally result, again without any accompanying hard X-ray pulsation.

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