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| Paper: |
The slow neutron capture process at low metallicity |
| Volume: |
458, Galactic Archaeology: Near-Field Cosmology and the Formation of the Milky Way |
| Page: |
35 |
| Authors: |
Karakas, A. I.; Lugaro, M.; Stancliffe, R. J.; Rijs, C. |
| Abstract: |
We have performed calculations for the slow neutron capture process
(the s process) in stellar models in the mass range 0.9 to 6 solar
masses at a metallicity of [Fe/H]=-2.3. The models were computed with
two different stellar evolution codes and our results were compared to
the composition of the elements heavier than Fe observed in
carbon-enhanced metal-poor (CEMP) stars. Our models provide an
explanation for the compositions of CEMP stars showing an s-process
signature (CEMP-s) but not for the composition of CEMP stars showing
both s-process and rapid neutron-capture (r-process) signatures
(CEMP-s/r). To explain the composition of CEMP-s/r stars we propose the
existence of a “s/r” neutron-capture process, which may be a
superposition of, or a process in-between, the classical s and r
processes. |
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