Mathematics – Logic
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8635h&link_type=abstract
HST Proposal ID #8635
Mathematics
Logic
Hst Proposal Id #8635 Hot Stars
Scientific paper
The recent discovery of radial and nonradial mode pulsations in nearly 20 sdB stars makes it possible to use asteroseismology to probe the internal structure of these stars and discern their evolutionary status; this is needed for reasons as diverse as understanding the late stages of stellar evolution and the calibration of the observed ultraviolet upturn in giant elliptical galaxies as an age indicator. Central to any asteroseismological study is an identification of the pulsation driving mechanism; evidence to date suggests that this is due to the recently discovered heavy metal opacity. The necessary metal abundance has to be maintained by diffusive equilibrium between gravitational settling and radiative levitation. Abundance analyses of high resolution optical spectra have, however, revealed that the surface iron abundance is not discriminating between pulsating and non-pulsating sdB stars. We propose to extend the abundance analyses of three pulsating sdB stars and two non-pulsating sdB stars to chemical elements unobservable from the ground using echelle UV spectra; this would enable diffusion/pulsation calculations to be tested by searching for significant differences in their surface abundance patterns. The targets are chosen to cover the full range of sdB gravities since logg is the dominant parameter for both diffusion and pulsation.
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