Choplin, A, Hirschi, R, Meynet, G, Ekström, S, Chiappini, C and Laird, A (2018) Non-standard s-process in massive rotating stars. Astronomy and Astrophysics, 618. ISSN 1432-0746

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Abstract

Context
Recent studies show that rotation significantly affects the s-process in massive stars.

Aims
We provide tables of yields for non-rotating and rotating massive stars between 10 and 150 M⊙ at Z = 10−3 ([Fe/H] = −1.8). Tables for different mass cuts are provided. The complete s-process is followed during the whole evolution with a network of 737 isotopes, from hydrogen to polonium.

Methods
A grid of stellar models with initial masses of 10, 15, 20, 25, 40, 60, 85, 120, and 150 M⊙ and with an initial rotation rate of both 0% or 40% of the critical velocity was computed. Three extra models were computed in order to investigate the effect of faster rotation (70% of the critical velocity) and of a lower 17O(α, γ) reaction rate.

Results
At the considered metallicity, rotation has a strong impact on the production of s-elements for initial masses between 20 and 60 M⊙. In this range, the first s-process peak is boosted by 2−3 dex if rotation is included. Above 60 M⊙, s-element yields of rotating and non-rotating models are similar. Increasing the initial rotation from 40% to 70% of the critical velocity enhances the production of 40 ≲ Z ≲ 60 elements by ∼0.5−1 dex. Adopting a reasonably lower 17O(α, γ) rate in the fast-rotating model (70% of the critical velocity) boosts again the yields of s-elements with 55 ≲ Z ≲ 82 by about 1 dex. In particular, a modest amount of Pb is produced. Together with s-elements, some light elements (particularly fluorine) are strongly overproduced in rotating models.

Item Type: Article
Additional Information: © EDP Sciences. This is the final published version of the article (version of record). It first appeared online via EDP Sciences at http://doi.org/10.1051/0004-6361/201833283 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: stars, massive, rotation, interiors, abundances, chemically peculiar, nuclear reactions, nucleosynthesis, abundances
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 25 Oct 2018 15:32
Last Modified: 25 Oct 2018 15:38
URI: http://eprints.keele.ac.uk/id/eprint/5462

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