The Chronology of the Formation of the Galactic Halo and Disk

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

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2419z&link_type=abstract

HST Proposal ID #2419

Other

Hst Proposal Id #2419

Scientific paper

Observations with the PC will be used to construct color-magnitude diagrams that reach more than 2 mag. below the main-sequence turnoffs in 2 globular clusters. One is a very metal-poor cluster near the galactic center, and the other is a metal-rich cluster that belongs to the disk system. The HST is needed because only it can provide the high resolution necessary for photometry in the very 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. The chronologies of the halo and the disk that result from these data will constrain theories of galactic evolution, for they will indicate the time scale of halo formation and lag-time between halo and disk formation.

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