Other
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...20112301s&link_type=abstract
American Astronomical Society, 201st AAS Meeting, #123.01; Bulletin of the American Astronomical Society, Vol. 34, p.1304
Other
Scientific paper
We report results of a search of Local Group galaxies for bright post-asymptotic-giant-branch (PAGB) stars. PAGB stars of spectral types A and F are the brightest members of Population II, and should have an extremely narrow luminosity function. PAGB stars are easily identifiable because their low surface gravities give them very large Balmer jumps. These factors should make PAGB stars excellent standard candles. We have established a system of standard stars in a photometric system that combines the Gunn u filter (whose bandpass lies entirely below the Balmer jump) with the standard BVI system. We have obtained uBVI photometry of most of the members of the Local Group, including WLM, NGC 147, NGC 185, NGC 205, Phoenix, Fornax, and NGC 6822, and fields in the halos of M31 and M33. We have identified a number of PAGB candidates for spectroscopic follow-up, and confirm that the luminosity distribution is sharply peaked. Adopting a luminosity of MV=-3.4 based on PAGB stars in Galactic globular clusters, we present a tally of distance measures to these objects and compare them to those derived from other standard candles.
Bond Howard E.
Siegel Michael Hiram
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