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Non-standard s-process in massive rotating stars

Hirschi, Raphael

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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(a, ?) 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(a, ?) 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.

Acceptance Date Jul 18, 2018
Publication Date Oct 23, 2018
Publicly Available Date Mar 29, 2024
Journal Astronomy and Astrophysics
Print ISSN 2329-1273
Publisher Hans Publishers
DOI https://doi.org/10.1051/0004-6361/201833283
Keywords stars, massive, rotation, interiors, abundances, chemically peculiar, nuclear reactions, nucleosynthesis, abundances
Publisher URL http://doi.org/10.1051/0004-6361/201833283

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