Prospects for the Flash-Driven Thermal-Pulse s-Process in Low-Metallicity Stars

Details Prospects for the Flash-Driven Thermal-Pulse s-Process in Low-Metallicity Stars Prospects for the Flash-Driven Thermal-Pulse s-Process in Low-Metallicity Stars

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aas...19911001w&link_type=abstract

American Astronomical Society, 199th AAS Meeting, #110.01; Bulletin of the American Astronomical Society, Vol. 33, p.1475

Astronomy and Astrophysics

Astronomy

Scientific paper

Recently, it has been proposed that low-metallicity stars may experience a different paradigm for s-process nucleosynthesis. In particular, a single-episode of neutron exposure may occur during the initial onset of the thermally pulsing AGB. This seems marginally supported by the enhanced s-process abundances observed in two stars. A crucial ingridient of this hypothesis is that there should be a change in the characteristic s-process abundance curve for [Fe/H] < -2.5. In this talk we survey what evidence exists for such a transition from observed abundances of neutron-capture elements in metal-poor halo stars. We suggest that evidence indeed exists for such a transition at the right metallicity.

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