Post-AGB Stars in the Halo of M81

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Hst Proposal Id #10136 Stellar Populations

Scientific paper

Post-asymptotic-giant-branch {PAGB} stars of spectral types A-F are the brightest members of Population II. We have shown, using ground-based observations, that PAGB stars have tremendous potential as highly efficient standard candles and as tracers of halo populations and late stellar evolution. Our analysis of PAGB stars in archival HST images of M32, based on the equivalent of one orbit of HST time, precisely reproduces the accepted distance. We propose to obtain ACS/WFC and WFPC2 images of fields in the halo of M81, as another test of the PAGB method. We show that 4 orbits of HST data will produce a distance of comparable accuracy to the much more laborious Cepheid technique. If successful on M81, we will propose in the next cycle to measure the distance to Virgo using our method, a distance ladder that has only two rungs {trigonometric parallaxes of subdwarfs to calibrate PAGB stars in globular clusters, and then PAGB stars in Virgo}.

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