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NuGrid stellar data set - III. Updated low-mass AGB models and s-process nucleosynthesis with metallicities Z=0.01, Z=0.02 and Z=0.03

Battino, U; Tattersall, A; Lederer-Woods, C; Herwig, F; Denissenkov, P; Hirschi, R; Trappitsch, R; den Hartogh, J W; Pignatari, M

Authors

U Battino

A Tattersall

C Lederer-Woods

F Herwig

P Denissenkov

R Hirschi

R Trappitsch

J W den Hartogh

Abstract

The production of the neutron-capture isotopes beyond iron that we observe today in the solar system is the result of the combined contribution of the r-process, the s-process and possibly the i-process. Low-mass AGB (1.5 < M/M⊙ < 3) and massive (M > 10 M⊙) stars have been identified as the main site of the s-process. In this work we consider the evolution and nucleosynthesis of low-mass AGB stars. We provide an update of the NuGrid Set models, adopting the same general physics assumptions but using an updated convective-boundary mixing model accounting for the contribution from internal gravity waves. The combined data set includes the initial masses MZAMS/M⊙ = 2, 3 for Z = 0.03, 0.02, 0.01. These new models are computed with the MESA stellar code and the evolution is followed up to the end of the AGB phase. The nucleosynthesis was calculated for all isotopes in post-processing with the NuGrid mppnp code. The convective boundary mixing model leads to the formation of a 13C-pocket three times wider compared to the one obtained in the previous set of models, bringing the simulation results now in closer agreement with observations. Using these new models, we discuss the potential impact of other processes inducing mixing, like rotation, adopting parametric models compatible with theory and observations. Complete yield data tables, derived data products and online analytic data access are provided.

Journal Article Type Article
Publication Date 2019-10
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press (OUP)
Peer Reviewed Peer Reviewed
Volume 489
Issue 1
Pages 1082–1098
Institution Citation Battino, U., Tattersall, A., Lederer-Woods, C., Herwig, F., Denissenkov, P., Hirschi, R., …Pignatari, M. (2019). NuGrid stellar data set - III. Updated low-mass AGB models and s-process nucleosynthesis with metallicities Z=0.01, Z=0.02 and Z=0.03. Monthly notices of the Royal Astronomical Society, 489(1), 1082–1098. https://doi.org/10.1093/mnras/stz2158
DOI https://doi.org/10.1093/mnras/stz2158
Keywords Space and Planetary Science; Astronomy and Astrophysics;Stars: abundances, evolution, interiors
Publisher URL https://academic.oup.com/mnras/article/489/1/1082/5552141

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© The Author(s) 2019. Published by Oxford University Press on behalf of The Royal Astronomical Society.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.




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