Physics
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9884a&link_type=abstract
HST Proposal ID #9884
Physics
Hst Proposal Id #9884 Stellar Populations
Scientific paper
The M81 group is of the nearest galaxy groups, but its properties are quite different from the Local Group, providing a different evolutionary environment for its member galaxies. This team has been studying M81-group analogs to Local Group dwarf elliptical {dE} galaxies. We observed two M81-group dEs with WFPC2: the results were published in Caldwell et al. {1998}. These observations revealed the upper two magnitudes of the red giant branch, yielding distance via the luminosity of the red giant branch tip, mean abundance via the mean giant branch color and first assessment of the star formation history via the frequency of occurrence of upper-AGB stars. Despite the different environment, the two M81-group dEs follow the Local Group {absolute magnitude, mean abundance} relation. But without data for additional dEs in nearby groups, particularly at higher luminosities, we can't definitely say whether this relation is universal or not. Establishing the answer to this question is vital because the relation is fundamental to theories of dE formation within dark matter halos, and the general applicability of these theories requires demonstration that the relation isn't strongly influenced by environment. This proposal requests ACS/WFC observations of five M81-group dEs to resolve this question.
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