Computer Science – Sound
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9910a&link_type=abstract
HST Proposal ID #9910
Computer Science
Sound
Hst Proposal Id #9910 Hot Stars
Scientific paper
HST observations of WZ Sagittae by Knigge et al. {2002} detect prominent oscillations in the ultraviolet lightcurve following outburst. The oscillations probably arise in or near the boundary layer between the accretion disk and the white dwarf, and are a particularly clear example of the quasi- periodic variability seen in many accreting systems. We propose to investigate theoretically the origin and predicted properties of this variability. To do this we will run global magnetohydrodynamic simulations of the inner accretion disk and boundary layer, from which we will calculate predicted lightcurves using a range of assumptions as to how energy is dissipated and radiated from the disk. The temporal power spectrum of the predicted emission will be calculated and used as the primary point of comparison with observations. If we are able to reproduce the observations successfully, the investigation will provide a sound basis for using the observed variability of cataclysmic variables in the UV to constrain the physical properties of the white dwarf and inner accretion flow.
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