Searching for Signs of a Double Generation of Stars in Galactic Globular Clusters

Details Searching for Signs of a Double Generation of Stars in Galactic Globular Clusters Searching for Signs of a Double Generation of Stars in Galactic Globular Clusters

Jul 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10922p&link_type=abstract

HST Proposal ID #10922. Cycle 15

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Scientific paper

This proposal has been stimulated by new findings of ours that may have a strong impact on the interpretation of globular cluster GC stellar populations. In 2004, based on HST data, we have found that the main sequence of the Galactic globular cluster Omega Centauri is split into two sequences; spectroscopic analysis has shown that the only isochrones which are able to fit the combination of color and metallicity of the bluest of the two sequences were younger and greatly enriched in helium. A number of observational facts, and theoretical evidence suggest that our results on Omega Centauri might represent an extreme case of a phenomenon which has also been at work in other GCs. We have selected the most promising GCs to find out whether this hypothesis is correct, and make a strong case for its likelihood and the value of pursuing it.

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