Ultraviolet Pulsations in WZ Sagittae

Details Ultraviolet Pulsations in WZ Sagittae Ultraviolet Pulsations in WZ Sagittae

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6605p&link_type=abstract

HST Proposal ID #6605

Physics

Hst Proposal Id #6605 Binaries And Star Fo

Scientific paper

WZ Sagittae is one of the most famous and extensively studiedcataclysmic variables. High-speed photometry at quiescenceshows 28 s pulsations, whose origin is still unknown. Alsopuzzling is the high X-ray luminosity at quiescence; afterphotospheric light is subtracted, the star remains withL_x/L_opt~30, a surprisingly high ratio for any plausibleaccretion theory. An elegant solution to both problems wouldbe achieved if the white dwarf is predominantly a `propellor'in quiescence, with the X-rays generated not in an accretionshock, but in the tangled, field-entrained plasma at themagnetospheric boundary. High-speed spectrophotometry in theUV can specify the origin of the pulsations by measuring thepulse fraction in continuum and lines, and can perhaps measurethe photospheric magnetic field by `freezing' the Zeeman-splitspectral features of the white dwarf as a function ofrotational phase.

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