The Chronology of the Galactic Halo and Disk CYCLE4HIGH

Details The Chronology of the Galactic Halo and Disk CYCLE4HIGH The Chronology of the Galactic Halo and Disk CYCLE4HIGH

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5366z&link_type=abstract

HST Proposal ID #5366

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Hst Proposal Id #5366 Galaxies &Amp, Clusters Stellar Populations

Scientific paper

Observations with the WFPC2 will be used to construct color-magnitude diagrams that precisely determine the magnitude and color of the main-sequence turnoff and lower giant branch, and allow the ages of 7 globular clusters to be derived. Four are metal-rich clusters of the disk population and three are very metal-poor clusters near the galactic center. Only the HST can provide the very high resolution necessary for photometry to the required faint limits in the crowded fields of these clusters. The ages of the clusters will be measured from the c-m diagrams using several techniques, and will be compared with each other and with the ages derived for other clusters from ground-based observations. Our investigation will yield the first chronology of the halo and thick disk clusters near the galactic center, where star formation may have proceeded more rapidly than in the outer, lower density regions. Age differences > 3 Gys. are now known to exist among the globular clusters in the outer halo, and the addition of our results will indicate the timescales of halo and disk formation as functions of galactocentric distance. This will tightly constrain theories of the evolution of the Galaxy. This proposal is a resubmission of a GO proposal that had to be largely deferred until after the repair mission.

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