Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21915208t&link_type=abstract
American Astronomical Society, AAS Meeting #219, #152.08
Astronomy and Astrophysics
Astronomy
Scientific paper
There are two main processes involved in the creation of elements with a Z > 30; the "rapid" r-process, and the "slow" s-process. The r-process and s-process are neutron-capture processes, meaning that starting with a base nuclei, they capture neutrons which then beta decay into a proton and an electron.
The r-process requires extreme conditions: high neutron fluxes and high temperatures thus limiting the environments where it can occur. Current understanding of these processes alone does not appear to account for all n-capture isotopic abundances observed.
We are able to reproduce an earlier result shown by Burris et al (2000) that showed that Ba had a bimodal trend when compared to Eu. This indicates that Ba is created by the r-process early in the Galaxy's history. We propose to look for such trends in the lighter n-capture elements such as Yttrium, Zirconium and Strontium. These elements are of interest since they do not appear to have a single r-process component responsible for their production. Using survey stars from Simmerer et al (2004) new abundance values for these elements have been determined. Element to element comparisons have been conducted to search for trends similar to those known for main r-process elements as well as similarities between the lighter n-capture elements.
Burris Debra L.
Odekirk T.
Teffs Jacob
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