Computer Science
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4416f&link_type=abstract
HST Proposal ID #4416
Computer Science
Hst Proposal Id #4416
Scientific paper
We propose to construct a far-UV color-magnitude diagram for the point sources detected in FOC images of 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 HUT and FOC data is that the resolved sources are mostly low-mass PAGB stars. If so, our observations will provide the first direct estimates of the PAGB star mass distribution, and will provide important insight into the differences in the evolution of the stellar populations in these two galaxies, the amount of mass-loss among the AGB progenitor stars and evolution along the PAGB. By combining our observations through different filters, we will be able to assess the emission-line contribution and search for variability. Comparison with the HUT data will allow a precise estimate of the contribution to the far-UV light from PAGB stars of different mass, and will allow a more precise determination of the spectral-energy distribution of the remaining unresolved population.
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