Stars in nearly all globular clusters show complex relations among the abundances light elements (up to Na). Many also show anti-correlations of Mg and Al. A rare few display variations in K. Until now, only one cluster (M15) conclusively showed any star-to-star variation in neutron-capture elements, like Eu. Using a trick of stellar evolution, I show that these variations are primordial, not caused by external pollution. I also show evidence that M92 also has variations in neutron-capture abundances among the first generation of stars but not the second. The evidence points to a very prompt, rare source of r-process enrichment.
Speaker: Evan Kirby, Professor, University of Notre Dame, South Bend
Host: Professor Giacomo Fragione
Joan West
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