Multiple Stellar Populations in Galactic Globular Clusters

Details Multiple Stellar Populations in Galactic Globular Clusters Multiple Stellar Populations in Galactic Globular Clusters

Jul 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12311p&link_type=abstract

HST Proposal ID #12311. Cycle 18

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Scientific paper

This is a proposal to bring the unique new properties of WFC3 to bear on the most exciting recent development in stellar populations: multiple generations of stars in globular clusters.From our vantage point in the midst of these developments, we feel that the present-day situation merits a concentration on increasing the depth of knowledge in clusters that are already known to have multiple populations, rather than merely increasing the list of clusters with perplexing peculiarities.We are therefore proposing to look for a clear splitting of the main sequence {and other sequences} of 47 Tuc, M4, M22, NGC 1851, and NGC 6752, and quantify them. The main-sequence study will cast particular light on the question of helium enrichment. Coupling the requested F275W data with F814W images available from the archive will allow us to follow the multiple sequences in the color magnitude diagram from the main sequence to the horizontal branch and asymptotic giant branch, and therefore constrain the effects of enhanced He and CNO on their evolution.;

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