A new model for s-process nucleosynthesis in low-mass, low-metallicity AGB stars

Details A new model for s-process nucleosynthesis in low-mass, low-metallicity AGB stars A new model for s-process nucleosynthesis in low-mass, low-metallicity AGB stars

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003nupha.718..193i&link_type=abstract

Nuclear Physics A, Volume 718, p. 193-196.

Physics

Nuclear Physics

2

Scientific paper

We have investigated evolution of low-mass, low-metallicity AGB stars. We evolved models with masses ranging from 1 to 3Msolar and metallicity of [Fe/H] = -2.7. We found for M <~ 2.5Msolar models that in the early phase of the AGB evolution convective shell triggered by thermal runaway of He shell burning extends upwards and reaches into the bottom of the overlying H-rich envelope. Protons are mixed into hotter He intershell. Proton capture reactions occur under He burning conditions and lead to release of huge amounts of energy. This phenomenon causes the surface chemical composition to change dramatically. We present surface abundance changes of CNO elements and lithium in this event.

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