2022A&A...657A..28Y -
Astronomy and Astrophysics, volume 657A, 28-28 (2022/1-1)
First models of the s process in AGB stars of solar metallicity for the stellar evolutionary code ATON with a novel stable explicit numerical solver.
YAGUE LOPEZ A., GARCIA-HERNANDEZ D.A., VENTURA P., DOHERTY C.L., DEN HARTOGH J.W., JONES S.W. and LUGARO M.
Abstract (from CDS):
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), which includes an advective scheme for the convective overshoot that leads to the formation of the main neutron source, 13C. Each model is post-processed with three different values of the free overshoot parameter. Included in the code SNUPPAT is the novel Patankar-Euler-Deflhard explicit numerical solver, which 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 of 12C in the He-rich intershell in ATON results in an s-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 a diffusive numerical scheme for the convective overshoot results in significant s-process nucleosynthesis for the 5 M☉ models as well, which may be in contradiction with observations.
Abstract Copyright:
© ESO 2021
Journal keyword(s):
stars: abundances - stars: AGB and post-AGB - methods: numerical - nuclear reactions, nucleosynthesis, abundances
Simbad objects:
12
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