Rapid oscillations in cataclysmic variables. 11: X-ray pulses in YY Draconis

Details Rapid oscillations in cataclysmic variables. 11: X-ray pulses in YY Draconis Rapid oscillations in cataclysmic variables. 11: X-ray pulses in YY Draconis

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105.1116p&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 692, p. 1116-1119

Astronomy and Astrophysics

Astronomy

13

Cataclysmic Variables, Stellar Oscillations, Stellar Rotation, Stellar Spectrophotometry, White Dwarf Stars, X Ray Astronomy, Light Curve, Rosat Mission, Stellar Luminosity, Stellar Magnetic Fields

Scientific paper

ROSAT observations of the cataclysmic variable YY Draconis reveal pulses with a period of 264.6 + or - 1.2 s, confirming the presence of a rapidly rotating, magnetic white dwarf. Comparison with the periods seen in ultraviolet and blue light indicates that the 275-s ultraviolet signals arises from the reprocessing of X-ray pulsations in structures fixed in the binary reference frame. Only harmonics and orbital sidebands of the white dwarf spin frequency are observed, not the spin frequency itself.

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