Imaging of M31-GROUP Galaxies -- Cycle 2

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Hst Proposal Id #3870

Scientific paper

This augmentation proposal picks up some high-quality parts of GTO proposal OS-1277 that are in quite serious danger of being lost, as overhead charges reduce the amount of actual exposure. The subject is M31 and its companions; there are two parts. (1) Near the centers of M31 and M32, FOC96 exposures will trace the distribution of metal-poor giants, as well as the distribution of the underlying and dominant metal- rich population, and also attempt to use pixel statistics to investigate the top of the luminosity function of the metal-rich giants. An attempt at the upper part of the color-magnitude array will be made in a field 3 arcmin from the center of M31. The FOC exposures will be accompanied by parallel PC exposures on M31 globular clusters. (2) For the dwarf galaxies NGC 205, 147, and 185, FOC96 exposures in two colors will investigate the centers (where dust and luminous stars are already known to exist in 2 of the 3), while parallel WFC exposures will do the upper part of the HR diagrams farther out.

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