Other
Scientific paper
Jul 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11639s&link_type=abstract
HST Proposal ID #11639. Cycle 17
Other
1
Scientific paper
Our past HST studies of the temperatures of 9 accreting, pulsating white dwarfs in cataclysmic variables show that 3 are in the normal instability strip for single white dwarfs, but the other 6 are much hotter {15,000-16,500K}. This dual strip has been proposed to be due to mass differences in the white dwarfs related to evolutionary history and driven by the ionization of different elements in their respective driving regions. In 2007, GW Lib {the brightest and best studied of the 6 hot accreting pulsators} and V455 And {the brightest and best studied of the 3 cool accreting pulsators} underwent rare large amplitude dwarf nova outbursts {known to heat the white dwarf} and their pulsations disappeared. We propose COS observations to: a} take advantage of the unprecedented opportunity to view the change in pulsation modes due to cooling of the white dwarf envelope and b} determine the masses of the white dwarfs to test the dual strip theory. In addition, a nova that had its outburst 22 yrs ago has begun non-radial pulsations as it returns to quiescence. We will use COS to determine its temperature in relation to the instability strip for the pulsating white dwarfs in dwarf novae.;
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