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The Age of the Galaxy from Thorium Cosmochronometry
C. Sneden, J. J. Cowan
The long-lived radioactive element thorium can potentially provide a simple and direct clock to determine the age of our Galaxy. Spectroscopic investigations of thorium in metal-po…
Neutron-Capture Elements in the Early Galaxy: Insights from a Large Sample of Metal-Poor Giants
Debra L. Burris, Catherine A. Pilachowski, Taft E. Armandroff +3
New abundances for neutron-capture (n-capture) elements in a large sample of metal-poor giants from the Bond survey are presented. The spectra were acquired with the KPNO 4-m echel…
Evidence of Multiple r-Process Sites in the Early Galaxy: New Observations of CS 22892-052
Christopher Sneden, John J. Cowan, Inese I. Ivans +4
First results are reported of a new abundance study of neutron-capture elements in the ultra-metal-poor (UMP; [Fe/H] = -3.1) halo field giant star CS 22892-052. Using new high reso…