Time and Date
10:00-12:00, June 13^th, 2024

Title
"Early r-process enrichment in globular clusters"
by Evan Kirby (University of Notre Dame)

Place (hybrid)
Room 745, Science Complex B (MAP H-03)

Zoom registration for participants:
https://us02web.zoom.us/meeting/register/tZErfuqtqDwsG9Be-PpcP-gPtSg23mVC8N-k#/

Abstract
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 1

Contact
Toru Kojo (Physics, GP-PU),
E-mail: toru.kojo.b1 * tohoku.ac.jp (Replace * with @)