Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5435f&link_type=abstract
HST Proposal ID #5435
Computer Science
Hst Proposal Id #5435 Galaxies &Amp, Clusters Stellar Populations
Scientific paper
We propose to construct a deep far-UV color magnitude-diagram of resolved sources in the centers of M31 and M32. These data will be used, in conjunction with spectroscopy obtained by the Hopkins Ultraviolet Telescope, to provide constraints on the mix of stars responsible for the far-UV emission in old, metal-rich stellar populations. Our inference from the existing data is that the sources resolved in Cycle-1 and 2 FOC images are mostly low-mass PAGB stars. Such stars probably produce less than 60% of the far-UV flux from M31, with the remainder coming from PEAGB, AGB-Manque, and EHB stars. Our proposed observations are deep enough to resolve PEAGB stars and AGB-Manque stars and provide the first direct evidence for these modes of stellar evolution. The relative numbers of these stars, the color of the remaining diffuse component, and the spectral energy distribution measured by HUT, will permit a precise estimate of the contribution from EHB stars. Comparison of the results from M31 and M32 will provide important insight into the differences in the evolution of the stellar populations in these two galaxies.
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