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astro-ph2000
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…
astro-ph2000
Galaxy Mergers: A Search for Chemical Signatures
Inese I. Ivans, Bruce Carney, Luisa de Almeida +1
We have gathered high resolution echelle spectra for more than two dozen high-velocity metal-poor field stars, including BD+80 245, a star previously known to have extremely low [a…
astro-ph2000
Do AGB Stars Differ Chemically from RGB Stars in Globular Clusters?
Christopher Sneden, Inese I. Ivans, Robert P. Kraft
Recent improvements in globular cluster colour-magnitude diagrams, coupled with an increase in large-sample spectroscopic abundance studies of cluster giants, finally allow some at…