The r-Process in the Early Galaxy (original) (raw)

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© 2002. The American Astronomical Society. All rights reserved. Printed in U.S.A.
The Astrophysical Journal,Volume 579,Number 2Citation Jennifer A. Johnson and Michael Bolte 2002 ApJ 579 616DOI 10.1086/342829

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Dates

1. Received 2001 October 25
2. Accepted 2002 July 12

0004-637X/579/2/616

Abstract

We report Sr, Pd, and Ag abundances for a sample of metal-poor field giants and analyze a larger sample of Y, Zr, and Ba abundances. The [Y/Zr] and [Pd/Ag] abundance ratios are similar to those measured for the _r_-process-rich stars CS 22892-052 and CS 31082-001. The [Pd/Ag] ratio is larger than predicted from the solar system _r_-process abundances. The constant [Y/Zr] and [Sr/Y] values in the field stars place strong limits on the contributions of the weak _s_-process and the main _s_-process to the light neutron-capture elements. Stars in the globular cluster M15 possess lower [Y/Zr] values than the field stars. There is a large dispersion in [Y/Ba]. Because the _r_-process is responsible for the production of the heavy elements in the early Galaxy, these dispersions require varying light-to-heavy ratios in _r_-process yields.

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