SIMBAD references

2002ApJ...579..616J - Astrophys. J., 579, 616-625 (2002/November-2)

The r-process in the early galaxy.

JOHNSON J.A. and BOLTE M.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): Galaxy: Halo - Nuclear Reactions, Nucleosynthesis, Abundances - Stars: Abundances - Stars: Population II

Simbad objects: 25

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2020.02.20-00:16:54

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