Subaru/HDS studies of r-process elements in metal-poor stars

Details Subaru/HDS studies of r-process elements in metal-poor stars Subaru/HDS studies of r-process elements in metal-poor stars

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13q.585h&link_type=abstract

In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J

Astronomy and Astrophysics

Astronomy

Stellar Abundances

Scientific paper

We have obtained high-quality spectra of 22 very metal-poor stars with Subaru/HDS in order to conduct detailed abundance studies of the neutron-capture elements including Th. As has been found by previous abundance studies the star-to-star scatter in the abundances of neutron-capture elements are very large. The abundance patterns of the heavy neutron-capture elements (56 < Z < 70) in seven objects with moderate to large excesses of the neutron-capture elements are similar to that of the solar system r-process component. These results strongly suggest that the heavy neutron-capture elements in these objects are primarily synthesized by the r-process.
On the other hand the abundance ratios of the light neutron-capture elements (38 < Z < 46) exhibit a rather large dispersion. Our results support previous suggestions that the light neutron-capture elements are likely to have been produced in different astrophysical sites from those associated with the production of the heavier ones.
The abundances of Th in a number of these stars are slightly higher than the values expected from the solar system r-process pattern. The Th/Eu ratio which has been commonly used for nuclei cosmo-chronometry exhibits a dispersion of about 0.3 dex in our sample.

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