Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7318f&link_type=abstract
HST Proposal ID #7318
Physics
Hst Proposal Id #7318 Stellar Populations
Scientific paper
We will use NICMOS to obtain deep IR photometry of the most metal-rich and most metal-poor globular clusters near the Galactic Center. We will use these data to determine accurate ages for our target clusters to test two ideas. First, are the clusters in the central regions the oldest clusters because star formation began there first due to the higher densities? Second, is there a significant age difference between the most metal-poor and most metal-rich clusters? We will observe NGC 6287, the most metal-poor globular cluster within 1 kpc of the Galactic Center {Fe/H=-2.0} and Liller 1 and Pal 6, among the most metal-rich {if not the most metal-rich} globulars in the Galaxy {Fe/H=+0.2 and -0.1, respectively}. All three clusters lie within 1 kpc of the Galactic Center. If abundance increased monotonically with time and mixing was rapid, these clusters will span the entire age range of globular clusters at the Galactic Center, giving us the largest lever arm on any age differences we find. Failure to detect an age difference will imply that star formation and chemical enrichment occurred rapidly in the inner halo if the clusters shared a common origin.
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