First models of s process in AGB stars of solar metallicity for the stellar evolutionary code ATON with a novel stable explicit numerical solver
arXiv:2110.08035 · doi:10.1051/0004-6361/202039318
Abstract
Aims. We describe the first s-process post-processing models for asymptotic giant branch (AGB) stars of masses 3, 4 and 5 M at solar metallicity (Z=0.018) computed using the input from the stellar evolutionary code aton. Methods. The models are computed with the new code snuppat(S-process NUcleosynthesis Post-Processing code for aton), including an advective scheme for the convective overshoot that leads to the formation of the main neutron source, 13C. Each model is post-processed with 3 different values of the free overshoot parameter. Included in the code snuppat is the novel Patankar-Euler-Deflhard explicit numerical solver, that we use to solve the nuclear network system of differential equations. Results. The results are compared to those from other s-process nucleosynthesis codes (Monash,fruity, and NuGrid), as well as observations of s-process enhancement in AGB stars, planetary nebulae, and barium stars. This comparison shows that the relatively high abundance of12C in the He-rich intershell in aton results in as-process abundance pattern that favours the second over the first s-process peak for all the masses explored. Also, our choice of an advective as opposed to diffusive numerical scheme for the convective overshoot results in significants-process nucleosynthesis also for the 5 M models, which may be in contradiction with observations.
19 pages, 11 figures, 2 appendices
References in corpus (12)
- The Dawes Review 2: Nucleosynthesis and stellar yields of low and intermediate-mass single stars
- Evolution and nucleosynthesis of asymptotic giant branch stellar models of low metallicity
- Rubidium-Rich Asymptotic Giant Branch Stars
- Helium enrichment and Carbon-star Production in Metal-rich Populations
- Lithium and zirconium abundances in massive Galactic O-rich AGB stars
- Barium & related stars and their white-dwarf companions I. Giant stars
- Barium Isotopic Composition of Mainstream Silicon Carbides from Murchison: Constraints for s-Process Nucleosynthesis in AGB Stars
- Circumstellar effects on the Rb abundances in O-rich AGB stars
- Partial mixing and the formation of 13C pockets in AGB stars: effects on the s-process elements
- IRAS08281-4850 and IRAS14325-6428: two A-type post-AGB stars with s-process enrichment
- Rubidium and zirconium abundances in massive Galactic asymptotic giant branch stars revisited
- Performance Improvements for Nuclear Reaction Network Integration