Physics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10233s&link_type=abstract
HST Proposal ID #10233
Physics
Hst Proposal Id #10233 Hot Stars
Scientific paper
Using UV observations with SBC and PR110L, we will obtain spectra of 3 newly discovered pulsating white dwarfs found among recent cataclysmic variables identified in the SDSS. Our Cycle 8 observations of the only previously known accreting, pulsating, white dwarf in GW Lib revealed large amplitude UV pulsations, a spectrum that showed metals and required a dual temperature fit with a high white dwarf mass. Since accretion likely causes abundance, rotation, and atmospheric temperature differences in accreting white dwarfs versus single white dwarfs, we will use these systems to explore the location of the instability strip for accreting white dwarfs and determine whether they are all massive and spotted objects. Light curves can be constructed at different wavelengths to aid in mode identification. Having knowledge of the atmospheres and interior structure of 4 sytems will provide great insight into the interaction of accretion, stellar pulsation and long term evolution. Due to optical contamination by the disk, stream, and/or secondary, the UV is the optimum regime to study pulsating, accreting white dwarfs.
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