Galactic Chemical Evolution: the Impact of the 13C-pocket Structure on the s-process Distribution
S. Bisterzo, C. Travaglio, M. Wiescher, F. Käppeler, R. Gallino
aa r X i v : . [ a s t r o - ph . S R ] J a n GALACTIC CHEMICAL EVOLUTION: THE IMPACT OF THE C-POCKET STRUCTURE ON THE S-PROCESSDISTRIBUTION
S. Bisterzo and C. Travaglio INAF - Astrophysical Observatory Turin, Turin, Italy [email protected]; [email protected]
M. WiescherJoint Institute for Nuclear Astrophysics (JINA), Department of Physics, University ofNotre Dame, IN, USAF. K¨appelerKarlsruhe Institute of Technology, Campus Nord, Institut f¨ur Kernphysik, Karlsruhe,GermanyandR. Gallino Department of Physics, University of Turin, ItalyReceived ; accepted Department of Physics, University of Turin, Italy B2FH Association-c/o Strada Osservatorio 20, 10023 Turin, Italy 2 –
ABSTRACT
The solar s -process abundances have been analyzed in the framework of aGalactic Chemical Evolution (GCE) model. The aim of this work is to implementthe study by Bisterzo et al. (2014), who investigated the effect of one of the majoruncertainties of asymptotic giant branch (AGB) yields, the internal structure ofthe C pocket. We present GCE predictions of s -process elements computed withadditional tests in the light of the suggestions provided in recent publications.The analysis is extended to different metallicities, by comparing GCE resultsand updated spectroscopic observations of unevolved field stars. We verify thatthe GCE predictions obtained with different tests may represent, on average, theevolution of selected neutron-capture elements in the Galaxy. The impact of anadditional weak s -process contribution from fast-rotating massive stars is alsoexplored. Subject headings:
Stars: AGB - Galaxy: evolution, abundances
1. GCE Solar s-process Predictions
AGB stars with low initial mass are the major responsible for the nucleosynthesis ofsolar s isotopes with A >