The discovery of UV oscillations in WZ SGE

Details The discovery of UV oscillations in WZ SGE The discovery of UV oscillations in WZ SGE

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.291l..57w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 291, p. L57-L61

Astronomy and Astrophysics

Astronomy

16

Ultraviolet Radiation, Stellar Radiation, Cataclysmic Variables, Oscillations, Novae, White Dwarf Stars

Scientific paper

We report the discovery of approximately 28-s UV oscillations in the cataclysmic variable WZ Sge. The strength of the oscillations is strongly wavelength-dependent: the oscillation amplitude decreases rapidly from about 1500 to about 1250 A. We interpret this decrease as an indication that the spectrum of the oscillations contains a broad Ly-alpha absorption line. This implies that the white dwarf photosphere is the origin of the oscillation signal: whether it is due to white dwarf pulsations or magnetically channelled accretion onto a rapidly spinning white dwarf remains unknown.

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