Other
Scientific paper
Jul 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4318c&link_type=abstract
HST Proposal ID #4318
Other
Hst Proposal Id #4318
Scientific paper
Elemental abundances and the enrichment of interstellar gas are a strong function of the processes associated with the broad spectrum of stellar evolution. Stellar evolution theory predicts that specific elements can have dramatically different nucleosynthetic histories and so studying the gas phase abundances of such elements in both the Milky Way and other galaxies provides important information on both stellar and subsequently galactic evolution. We propose to study the abundances of the heavy elements Ge (Z = 32) and Kr (Z = 36) toward six stars representing three distinctly different galactic directions. These elements represent a) the heaviest elements studied in the ISM to date and b) nucleosynthetic origins uniquely different from any element yet studied in the ISM. Greater than 95% of the 'cosmic' abundance of Ge and Kr derive from a combination of the s- and r-process. Compare this with Zn (Z=30), traditionally the heaviest element studied in the ISM, for which greater than 88% of the cosmic abundance derives from 'Fe-peak' nucleosynthesis.
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