Computer Science
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12191l&link_type=abstract
HST Proposal ID #12191. Cycle 18
Computer Science
Scientific paper
The complex history and evolution of element production is reflected in theabundance ratios of the elements. The distinctive abundances patterns produced bynucleosynthesis in supernovae and stars can be used to explore the history of starformation and evolution in galaxies. Recent observations of damped Lyman-alphasystems have suggested that observations of r and s-process elements at highredshifts may soon provide a new window to explore chemical evolution.Paradoxically, we may soon have more detections of some elements in the interstellarmedium of these high redshift galaxies than in the Galactic ISM. However, without anunderstanding of the depletion behavior of these elements based upon observations ofnearby sightlines we may be unable to correctly disentangle the effects of dustdepletion and nucleosynthesis. We therefore propose to determine the depletion of rand s-process elements in two sightlines with relatively mild depletion patterns onnearly opposite parts of the sky. In addition to providing a baseline for studies athigh redshift, the long pathlength studied will enable us to search for abundancevariations within our Galaxy.;
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