GPPU Seminar
Early r-process enrichment in globular clusters
Evan Kirby
(University of Notre Dame)
Date
10:00-12:00, June 13th, 2024Place
(hybrid) Room 745, Science Complex B (H-02), Zoom registration mapAbstract
Stars in nearly all globular clusters show complex relations among the abundances of light elements (up to Na). Many also show anti-correlations of Mg and Al. 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. Then, I show that M92 also has variations in barium and lanthanide abundances (but not first-peak r-process) among the first generation of stars but not the second. The evidence points to a rare source of the main r-process that happened right at the start of the formation of the cluster.
Point
GSP 1Contact: Yusuke Tanimura (tanimura [at] nucl.phys.tohoku.ac.jp)