Physics
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9191b&link_type=abstract
HST Proposal ID #9191
Physics
Hst Proposal Id #9191 Stellar Populations
Scientific paper
The visually brightest members of Population II are post-AGB {PAGB} stars evolving through spectral types F and ANull. They are easily recognized through their huge Balmer jumps, if a filter at 3400 Angstrom is used, such as the F336W filter on WFPC2. PAGB stars are superb candidates for building a Population II distance scale because of their sharply peaked luminosity function, high luminosities, ease of detection, and relative freedom from reddening, metallicity, and age issues. PAGB stars are 4 visual magnitudes brighter than RR Lyrae variables and 1.5 mag brighter than the red-giant tip. Unlike RR Lyrae stars {and Population I Cepheids}, PAGB stars only require a single epoch of observation and are thus extremely efficient in terms of telescope usage. In this Archival program, we will use existing HST WFPC2 images to find PAGB A-F type stars in the Local Group dwarf ellipticals M32 and NGC 205, and in the more distant, massive elliptical Centaurus A {NGC 5128}, all of which of course lack Cepheid variables. We expect to establish distances with <10 Moreover, we will demonstrate the feasibility of our technique with HST, laying the foundation to find PAGB stars in more distant ellipticals as far away as the Virgo Cluster.
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