Exceptional Galactic Halo Globular Clusters and the Second Parameter

Details Exceptional Galactic Halo Globular Clusters and the Second Parameter Exceptional Galactic Halo Globular Clusters and the Second Parameter

Jul 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008hst..prop11586d&link_type=abstract

HST Proposal ID #11586. Cycle 17

Physics

Scientific paper

We propose to obtain deep ACS-WFC images of six globular clusters {five of which have no previous HST photometry} that reside in the Galactic halo, where the second parameter effect is most pronounced. These globular clusters are among the least studied in the Galaxy and yet, from the perspective of the second parameter phenomenon, the most intriguing. With the best available CMDs only reaching the vicinity of the main sequence turn off at present, the unique sensitivity and resolution of ACS-WFC will yield ages of unprecedented precision for these clusters. These data will provide us with new insight into the stellar populations present in the outer Galactic halo and the nature of the second parameter. The second parameter plays a critical role in our understanding of the formation and evolution of the Galaxy and the proposed observations will shed new light on this problem and these exceptional clusters.;

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