Computer Science
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8769t&link_type=abstract
HST Proposal ID #8769
Computer Science
Hst Proposal Id #8769 Galaxies
Scientific paper
We wish to obtain deep V and I WFPC2 images of two nearby metal-deficient blue compact dwarf {BCD} galaxies UGC 4483 {Z_odot/23} and NGC 2366 equiv Mrk 71 {Z_odot/13}. Our main goal is to detect the red giant stellar population in these resolved BCDs to study their evolutionary history and constrain their ages. Are they young or old? On the basis of chemical evolution arguments, we have argued that all galaxies with Z < Z_odot/20 are young with ages < 100 Myr, while those with Z > Z_odot/20 are older. The high spatial resolution of the WFPC2 will allow to detect stars 3 mag fainter than the red giant tip in UGC 4483 and NGC 2366, both members of the M81 group at a distance of 3.44 Mpc, and determine stellar ages directly through color-magnitude diagrams. If our chemical evolution arguments are correct, then UGC 4483 should not possess a red giant population and not be older than 100 Myr, while such a population should be present in NGC 2366.
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