Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7436l&link_type=abstract
HST Proposal ID #7436
Computer Science
Hst Proposal Id #7436 Stellar Populations
Scientific paper
Recent observations with the Ultraviolet Imaging Telescope {UIT} have provided a complete sample of the hot post asymptotic giant branch {post-AGB} population in fourteen globular clusters. We have begun a program of optical and IUE spectroscopy to determine the fundamental stellar parameters {log L, T_ eff, log g} of these stars, but further progress requires HST ultraviolet spectroscopy of the hottest {T_ eff > 30,000 K} four post-AGB candidates, and HST ultraviolet and optical spectroscopy of three candidates in the crowded cluster cores. The determination of the fundamental stellar parameters of a complete sample of hot post-AGB stars will allow the first observational test of theoretical post-AGB lifetimes across the HR diagram. In addition, we will obtain a sensitive diagnostic for the masses of the currently forming white dwarfs in globular clusters by application of the core mass - luminosity relation for post-AGB stars. Our results will have important implications for models of the UV flux of old stellar populations, and for the use of cluster white dwarf standard candles to derive globular cluster distances {and ages}.
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