Computer Science
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..341b&link_type=abstract
NOAO Proposal ID #2001B-0341
Computer Science
Scientific paper
The brightest members of Population II are post-AGB (PAGB) stars evolving through spectral types F and A. The aim of this program is to find PAGB stars in the halos of galaxies in the Sculptor Group (the nearest galaxy grouping outside the Local Group). The importance of these stars is: (1) they will serve as probes of the structure of galactic halos, in the form of test particles much more numerous than planetary nebulae or globular clusters, with which we can look for features such as clumps or tidal streams; (2) the number counts will tell us the theoretically poorly known transition time from AGB to planetary nebula; and (3) PAGB stars should prove to be a superb new primary distance indicator, comparable to or better than Cepheids. PAGB stars of types F and A are easily recognized because of their large Balmer jumps. Our new uBVI photometric system is optimal for revealing them in galactic halos, due to their unique u-B colors. We anticipate finding ~150 PAGB stars per Mosaic field in the halos of the Sculptor spirals, in which they should appear at V~eq23. The 0.9-m telescope will be used to obtain uBVI calibrations of the fields relative to our standard stars, saving the 4-m Mosaic for the deep observations in the Sculptor Group.
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