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Scientific paper
Jul 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.6075g&link_type=abstract
HST Proposal ID #6075
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Hst Proposal Id #6075 Hot Stars
Scientific paper
Cataclysmic variables (CVs) have been extensively studied over the past two decades with X-ray, UV, optical and IR observations. The rapid variations present in these interacting binary systems allow direct study of astrophysical processes occurring on dynamic, thermal and thermonuclear timescales. Interpretation of results for these intensive studies of CVs relies in part on poorly determined fundamental parameters for most systems, the weakest link of which are masses as constrained by radial velocity amplitudes for the white dwarf primaries. We propose a new determination of orbital velocity amplitudes (K_1) using observations in the far UV where in a few systems the white dwarf spectrum is clearly visible. These observations will exploit the unique capabilities of HST and GHRS for a system of particular interest: U Gem. These observations will provide a definitive measure of K_1 for this pivotal dwarf nova, and allow for crucial checks of internal consistency on the solutions. Rapid oscillations will be analyzed to enable a complementary orbital delay timing solution. The resulting unique data sets are expected to support numerous other investigations of these white dwarfs which periodically accrete mass during outbursts.
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