First enrichment of r-process elements in our Galaxy

Details First enrichment of r-process elements in our Galaxy First enrichment of r-process elements in our Galaxy

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005nupha.758..603i&link_type=abstract

Nuclear Physics A, Volume 758, p. 603-606.

Physics

Nuclear Physics

4

Scientific paper

Observed large scatters in Eu, Ba, and Sr abundances of metal-poor stars provide clues to determine the site(s) of r-process. In particular, our observation using Subaru HDS gives sub-solar values of [Eu/Fe] for three extremely metal-poor stars. Using an inhomogeneous chemical evolution model, we show that the dominant source of Eu to be the low-mass end of the supernova mass range to account for the observation. On the other hand, scatters in [Sr/Ba] suggest existence of “weak”r-process, which produces lighter nuclei. We also discuss the yield of weak r-process, using new data of Pd abundances.

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