Soft X-ray pulsations from SS Cygni

Details Soft X-ray pulsations from SS Cygni Soft X-ray pulsations from SS Cygni

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..163c&link_type=abstract

Astrophysical Journal, Part 1, vol. 235, Jan. 1, 1980, p. 163-176.

Astronomy and Astrophysics

Astrophysics

77

Binary Stars, Dwarf Stars, Novae, Pulsed Radiation, Stellar Spectrophotometry, X Ray Sources, Black Body Radiation, Boundary Layer Stability, Heao, Light Curve, Pulse Duration, Stellar Luminosity, Stellar Models, X Ray Spectra

Scientific paper

Pulsed soft X-rays (0.1 to 0.5 keV) with a period of 9 sec and a pulsed fraction that varies between 0 and 100% were detected from the dwarf nova SS Cygni at the peak of an optical outburst. This detection confirms for the first time the supposed high energy origin of optical pulsations seen in erupting dwarf novae. The pulse shape is remarkably sinusoidal for such a large-amplitude oscillation. The X-ray pulsation observed in this outburst is not coherent, in contrast to previous claims for the related optical oscillations.

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