Stellar Spectroscopy and Nucleosynthesis

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Lambert, David AST 96-18414 Dr. Lambert and collaborators will carry out a diverse array of investigations into the chemical abundances of stars that will provide insieht into the processes of stellar nucleosynthesis and galactic chemical evolution. The wide variety of projects includes investigations of nearby F and G dwarfs to define the age and spatial dependence of chemical compositions at intermediate metallicities where sharp transitions in abundance patterns are seen, determination of Mg isotopic abundances that have the potential to constrain models of supernovae, observations directed at illuminating the nature of the s-process operating in late-type AGB stars, and the exploration of several groups of stars that present chemical 'puzzles.' Many of the projects build on previous results of the PI and collaborators, and a number of observations intend to make use of the new IR spectroscopic instrumentation available at national facilities and new instrumentation at the Hobby-Eberly Telescope. ***