March 26, 2024

Speaker: Evan Kirby (University of Notre Dame)

Contact Information: ekirby@nd.edu

Title:  Early r-process enrichment in globular clusters

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.

Visitor's room: 127

Visit Schedule:

Tuesday (March 26, 2024):

• 9:00 a.m.: Michael Strauss (Peyton 113)

• 9:30 a.m.: Jenny Greene (Peyton 0010

• 10:00 a.m:  Robert Lupton

• 10:30 a.m.: Andy Goulding (Peyton 117)

• 11:00 a.m.: Colloquium 

• 11:30 a.m.: Colloquium 

• 12:00 p.m.: Bahcall lunch

• 12:30 p.m.: Bahcall lunch

• 1:00 p.m.: Bahcall lunch

• 1:30 p.m.:  Ivanna Escala

• 2:00 p.m.: Jiaxuan Li

• 2:30 p.m.: Dongzi Li

• 3:00 p.m.: Tea Time with Grad Students in Grand Central 

• 3:30 p.m.: Tea Time with Grad Students in Grand Central 

• 4:00 p.m.: Grace Telford and Abby Mintz (103)

• 4:30 p.m.: Eric Moseley (Peyton 021)

Dinner Sign-up - add your name here:

Monday (March 25, 2024) Joint with IAS

1. Grace Telford

2. Postdoc Host: Ivanna Escala

3. Colloquium Speaker: Evan Kirby

4. IAS Host: Tomer Yavetz

5. PU: Miguel Montalvo

6. PU: Abby Mintz

7. PU: Jiaxuan Li

8. IAS:

9. IAS:

10. IAS:

STUDENTS HAVE PRIORITY.

PLEASE NO MORE THAN 8 PEOPLE (it is more difficult to properly interact with the speaker in larger groups).