a Search for Radial Pulsations in White Dwarfs

Details a Search for Radial Pulsations in White Dwarfs a Search for Radial Pulsations in White Dwarfs

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992hst..prop.3798k&link_type=abstract

HST Proposal ID #3798

Computer Science

Hst Proposal Id #3798

Scientific paper

Several classes of NONRADIALLY pulsating white dwarfs are known, with pulsation periods of several minutes. Theoretical work predicts that DB and DA white dwarfs that are slightly hotter than the known nonradial instability strips should be unstable to RADIAL pulsations with periods of about 0.1--1 second. However, ground-based observations have failed to reveal such periodicities. We propose to use HST's High Speed Photometer to search for the predicted radial pulsations in DB and DA white dwarfs. UV high-speed photometry offers the advantages of larger stellar fluxes (the effective temperatures of our three targets are 13,000--30,000 K) and significantly larger pulsation amplitudes (factors of 2 to 3) compared to ground-based photometry, along with freedom from atmospheric scintillation, giving HST a distinct gain over any ground-based facility. The presence (or absence) of the predicted rapid oscillations will provide significant new information for (or challenges to) the theory of white-dwarf pulsations, structure, and evolution.

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