Other
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8195h&link_type=abstract
HST Proposal ID #8195
Other
Hst Proposal Id #8195 Field Stellar Populations
Scientific paper
We propose to measure the metallicity distribution function {MDF} of the halo stars in the nearby {d 3.9Mpc} giant elliptical galaxy NGC 5128 by direct {V, I} color-magnitude photometry of its old red-giant stars. Because NGC 5128 is 2 magnitudes closer than any other giant E galaxy, it gives us a unique opportunity to study the enrichment history at a level of detail that is impossible for any other such galaxy. In Cycle 8, we will measure a very remote field at 35 kpc, and a second one in the inner halo at 7 kpc. At the distance of NGC 5128, the photometric limits of the WFPC2 camera reach almost 3 magnitudes in I down the red giant branch, allowing the construction of an accurate MDF. Combined with our Cycle 5 20-kpc field, the three halo fields will allow us to study the MDF and metallicity gradient through the halo, and connect these to enrichment history models.
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