Computer Science
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5729r&link_type=abstract
HST Proposal ID #5729
Computer Science
Hst Proposal Id #5729 Galaxies &Amp, Clusters Stellar Populations
Scientific paper
GO5019: We propose to survey the bolometric luminosities, colors, and space distribution of the most luminous asymptotic giant branch (AGB) stars in the bulge of M31. We seek to discover whether the bulge of this galaxy is relatively young, of order 10 Gyr rather than 15 Gyr. We will use the WFPC2 and the F675W (broad-R), F814W (broad-I) and F1042M (1 micron) filters. Knowing that F1042M falls on the first continuum point of M giants, we have shown that we can use 1.04 micron fluxes to reliably calculate bolometric magnitudes for these very red stars. Color information from F675W and F814W will permit (1) comparison with Galactic bulge M giants, (2) an estimate of the spread of abundance and (3) increase the accuracy of the bolometric magnitudes. Frames with the damaged HST show signs of resolution to within 3" of the M31 nucleus; The repaired HST should resolve stars close to the nuclei of these galaxies. We will measure bolometric luminosity functions to determine if the populations are intermediate age, and attempt to measure the abundance range for stars near the nucleus of M31. If metals have been lost due to winds, theory predicts that we should see a substantial spread of abundances even near the nucleus.
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