Multiple Generations of Stars in Massive Galactic Globular Clusters

Details Multiple Generations of Stars in Massive Galactic Globular Clusters Multiple Generations of Stars in Massive Galactic Globular Clusters

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007hst..prop11233p&link_type=abstract

HST Proposal ID #11233. Cycle 16

Physics

Scientific paper

This is a follow-up to recent HST imaging of NGC 2808, which discovered that its main sequence is triple, with three well-separated parallel branches Fig.~1. Along with the double MS of Omega Centauri, this challenges the long-held paradigm that globular clusters are simple, single stellar populations. The cause of this main sequence multiplicity in both clusters is likely to be differences in helium abundance, which could play a fundamental role in the understanding of stellar populations. We propose to image seven more of the most massive globular clusters, to examine their main sequences for indications of splitting.;

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