Physics
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4307k&link_type=abstract
HST Proposal ID #4307
Physics
Hst Proposal Id #4307
Scientific paper
We propose to use the High Speed Photometer to search for the previously unobserved phenomenon of RADIAL pulsations in white dwarfs. Three classes of NONRADIALLY pulsating white dwarfs are known, with pulsation periods ranging from several minutes to half an hour. Theory predicts that stars slightly hotter than the nonradial instability strips for DA, DB, and PG 1159-type white dwarfs should be unstable to radial pulsations, with periods between 0.1 and 10 seconds. We have received Cycle 2 HSP time to search several DA and DB candidates for these predicted rapid pulsations. In Cycle 3 we propose to use HSP to search for the predicted radial pulsations in 3 members of the PG 1159 class. High-speed UV photometry is free from atmospheric scintillation, and takes advantage of the larger stellar fluxes and larger pulsation amplitudes for these extremely hot (above 125,000 K) stars. Our targets are three known nonradial pulsators (two are central stars in planetary nebulae), so that the observations will also provide information on the wavelength dependence of the nonradial pulsation amplitudes. The presence (or absence) of radial pulsations will provide significant new information for (or challenges to) our understanding of white-dwarf pulsations, structure, and evolution.
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