The s-process in stellar population synthesis: a new approach to understanding AGB stars

@article{Marinovi2007TheSI,
  title={The s-process in stellar population synthesis: a new approach to understanding AGB stars},
  author={A. A. Bona{\vc}i{\'c} Marinovi{\'c} and Robert G. Izzard and Maria Lugaro and Onno Rudolf Pols},
  journal={Astronomy and Astrophysics},
  year={2007},
  volume={469},
  pages={1013-1025}
}
We find that galactic disk objects are reproduced by a spread of a factor of two in the effectiveness of the 13C neutron source. Lower metallicity objects can be reproduced only by lowering the average value of the effectiveness of the 13C neutron source needed for the galactic disk objects by at least a factor of 3. Using observations of s-process elements in post-AGB stars as constraints we find that dredge-up has to start at a lower core mass than predicted by current theoretical models… Expand
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References

SHOWING 1-10 OF 42 REFERENCES
Evolution of Asymptotic Giant Branch Stars
▪ Abstract The current status of modeling the evolution and nucleosynthesis of asymptotic giant branch (AGB) stars is reviewed. The principles of AGB evolution have been investigated in recent yearsExpand
The distribution of low-mass stars in the Galactic disc
We quantify the complex interdependence of stellar binarity, the stellar mass-luminosity relation, the mass function, the colour-magnitude relation and Galactic disc structure, all of which must beExpand
More lead stars
The standard model for the operation of the s-process in asymptotic giant branch (AGB) stars predicts that low-metallicity ([Fe/H] ≲ -1) AGB stars should exhibit large overabundances of Pb and Bi asExpand
s-Process nucleosynthesis in carbon stars
We present the first detailed and homogeneous analysis of the s-element content in Galactic carbon stars of N type. Abundances of Sr, Y, Zr (low-mass s-elements, or ls), Ba, La, Nd, Sm, and CeExpand
The 85Kr s-Process Branching and the Mass of Carbon Stars
We present new spectroscopic observations for a sample of C(N)-type red giants. These objects belong to the class of asymptotic giant branch stars, experiencing thermal instabilities in theExpand
The origin of the lead-rich stars in the Galactic halo: investigation of model parameters for the s-process
Several stars at the low-metallicity extreme of the Galactic halo show large spreads of lead and associated 'heavy' s-process elements ([Pb/hs]). Theoretically, an s-process pattern should beExpand
Post-AGB Stars
▪ Abstract In this contribution, a review is presented on the ample data obtained on post-AGB stars, both on the central stars and their circumstellar material. The fast evolutionary phase isExpand
s-Process Nucleosynthesis in Asymptotic Giant Branch Stars: A Test for Stellar Evolution
We study the slow neutron capture process (s-process) in asymptotic giant branch (AGB) stars using three different stellar evolutionary models computed for a 3 M☉, solar metallicity star. First weExpand
THE s-PROCESS IN ROTATING ASYMPTOTIC GIANT BRANCH STARS
We model the nucleosynthesis during the thermal pulse phase of a rotating, solar metallicity, asymptotic giant branch (AGB) star of 3 M☉, which was evolved from a main-sequence model rotating withExpand
EVOLUTION AND NUCLEOSYNTHESIS IN LOW-MASS ASYMPTOTIC GIANT BRANCH STARS. II. NEUTRON CAPTURE AND THE s-PROCESS
We present a new analysis of neutron capture occurring in low-mass asymptotic giant branch (AGB) stars suffering recurrent thermal pulses. We use dedicated evolutionary models for stars of initialExpand
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