Galactic Chemical Evolution of the s Process from AGB Stars

Abstract

We follow the chemical evolution of the Galaxy for the s elements using a Galactic chemical evolution (GCE) model, as already discussed by Travaglio et al. (1999, 2001, 2004), with a full updated network and refined asymptotic giant branch (AGB) models. Calculations of the s contribution to each isotope at the epoch of the formation of the solar system is determined by following the GCE contribution by AGB stars only. Then, using the r-process residual method we determine for each isotope their solar system r-process fraction, and recalculate the GCE contribution of heavy elements accounting for both the s and r process. We compare our results with spectroscopic abundances at various metallicities of [Sr,Y,Zr/Fe], of [Ba,La/Fe], of [Pb/Fe], typical of the three s-process peaks, as well as of [Eu/Fe], which in turn is a typical r-process element. Analysis of the various uncertainties involved in these calculations are discussed.

8 pages, 6 figures, 1 table

References in corpus (6)

• HE 0557-4840 - Ultra-Metal-Poor and Carbon-Rich
• Near-UV Observations of HD221170: New Insights into the Nature of r-Process-Rich Stars
• New Extremely Metal-Poor Stars in the Galactic Halo
• Carbon-Enhanced Metal-Poor Stars. III. Main-Sequence Turn-Off Stars from the SDSS/SEGUE Sample
• Chemical Abundance Analysis of the Extremely Metal-Poor Star HE 1300+0157
• A New Type of Extremely Metal Poor Star

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