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The i-process yields of rapidly accreting white dwarfs from multicycle He-shell flash stellar evolution models with mixing parametrizations from 3D hydrodynamics simulations

Denissenkov, Pavel A; Herwig, Falk; Woodward, Paul; Andrassy, Robert; Pignatari, Marco; Jones, Samuel

Authors

Pavel A Denissenkov

Falk Herwig

Paul Woodward

Robert Andrassy

Samuel Jones



Abstract

© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society We have modelled the multicycle evolution of rapidly accreting CO white dwarfs (RAWDs) with stable H burning intermittent with strong He-shell flashes on their surfaces for 0.7 ≤ MRAWD/Mo ≤ 0.75 and [Fe/H] ranging from 0 to −2.6. We have also computed the i-process nucleosynthesis yields for these models. The i process occurs when convection driven by the He-shell flash ingests protons from the accreted H-rich surface layer, which results in maximum neutron densities Nn, max ≈ 1013–1015 cm−3. The H-ingestion rate and the convective boundary mixing (CBM) parameter ftop adopted in the one-dimensional nucleosynthesis and stellar evolution models are constrained through three-dimensional (3D) hydrodynamic simulations. The mass ingestion rate and, for the first time, the scaling laws for the CBM parameter ftop have been determined from 3D hydrodynamic simulations. We confirm our previous result that the high-metallicity RAWDs have a low mass retention efficiency (η

Journal Article Type Article
Publication Date Sep 21, 2019
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 488
Issue 3
Pages 4258-4270
APA6 Citation Denissenkov, P. A., Denissenkov, P. A., Herwig, F., Woodward, P., Andrassy, R., Pignatari, M., & Jones, S. (2019). The i-process yields of rapidly accreting white dwarfs from multicycle He-shell flash stellar evolution models with mixing parametrizations from 3D hydrodynamics simulations. Monthly notices of the Royal Astronomical Society, 488(3), 4258-4270. https://doi.org/10.1093/mnras/stz1921
DOI https://doi.org/10.1093/mnras/stz1921
Keywords Space and Planetary Science; Astronomy and Astrophysics
Publisher URL https://academic.oup.com/mnras/article/488/3/4258/5531775
Additional Information This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society







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