Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5430b&link_type=abstract
HST Proposal ID #5430
Physics
Hst Proposal Id #5430 Galaxies &Amp, Clusters Stellar Populations
Scientific paper
We propose to image with the WFPC2 PC at two effective wavelengths, namely 1600 and 2180 A, the elliptical galaxies M32 and NGC 205. Imaging with FOC during Cycle 1 has revealed the possibility to detect individual UV bright stars on a diffuse background. Unfortunately remarkable disagreement between the nominal transmission curves and the ones we derived from our own observations has not allowed to take properly into account the effects of the readleak present in the FOC's filters. The much less readleak in WFPC2 PC+F185W and in WFPC2 PC+F255W makes this configuration the most appropriate one to investigate the nature of the UV stars, giving rise to the well-known n rising branch present in the far UV spectrum of early-type galaxies. The fainter magnitudes which can be reached and the determination of the (1600-2180) color will allow us to discriminate among the different candidates, such as P-AGB, P-EAGB, AGB manque`, contributing to the far UV light. These two galaxies are among the very few for which direct identification can be made of the UV bright stars that are known to exist in old stellar systems. These observations are prerequisite to our understanding of the source(s) of UV flux in both present-day galaxies and in galaxies at large lookback time.
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