L. Dardelet
The i-process and CEMP-r/s stars
Dardelet, L.; Ritter, C.; Prado, P.; Heringer, E.; Higgs, C.; Sandalski, S.; Jones, S.; Denissenkov, P.; Venn, K.; Bertolli, M.; Woodward, P.; Herwig, F.; Pignatari, M.; Bertolli, Michael; Dardelet, Laurent; Denisenkov, P A; Higgs, Clare; Jones, Samuel; Masikiv Heringer, Epson Thiago; Prado, Pablo; Ritter, Christian; Sandalski, Stou; Venn, Kim
Authors
C. Ritter
P. Prado
E. Heringer
C. Higgs
S. Sandalski
S. Jones
P. Denissenkov
K. Venn
M. Bertolli
P. Woodward
F. Herwig
M. Pignatari
Michael Bertolli
Laurent Dardelet
P A Denisenkov
Clare Higgs
Samuel Jones
Epson Thiago Masikiv Heringer
Pablo Prado
Christian Ritter
Stou Sandalski
Kim Venn
Abstract
© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. We investigate whether the anomalous elemental abundance patterns in some of the C-enhanced metal-poor-r/s (CEMP-r/s) stars are consistent with predictions of nucleosynthesis yields from the i-process, a neutron-capture regime at neutron densities intermediate between those typical for the slow (s) and rapid (r) processes. Conditions necessary for the i-process are expected to be met at multiple stellar sites, such as the He-core and He-shell flashes in low-metallicity low-mass stars, super-AGB and post-AGB stars, as well as low-metallicity massive stars. We have found that single-exposure one-zone simulations of the i-process reproduce the abundance patterns in some of the CEMP-r/s stars much better than the model that assumes a superposition of yields from s and r-process sources. Our previous study of nuclear data uncertainties relevant to the i-process revealed that they could have a significant impact on the i-process yields obtained in our idealized one-zone calculations, leading, for example, to ∼ 0:7dex uncertainty in our predicted [Ba/La] ratio. Recent 3D hydrodynamic simulations of convection driven by a He-shell flash in post-AGB Sakurai's object have discovered a new mode of non-radial instabilities: the Global Oscillation of Shell H-ingestion. This has demonstrated that spherically symmetric stellar evolution simulations cannot be used to accurately model physical conditions for the i-process.
Citation
Ritter, C., Dardelet, L., Prado, P., Heringer, E., Higgs, C., Sandalski, S., …Venn, K. The i-process and CEMP-r/s stars. Presented at Proceedings of Science
Conference Name | Proceedings of Science |
---|---|
Publication Date | Jan 1, 2014 |
Deposit Date | Jan 4, 2016 |
Publicly Available Date | Mar 29, 2024 |
Journal | Proceedings of science |
Electronic ISSN | 1824-8039 |
Peer Reviewed | Peer Reviewed |
Volume | 07-11-July-2015 |
Keywords | i-process |
Public URL | https://hull-repository.worktribe.com/output/383711 |
Publisher URL | Copy of paper from the conference Nuclei in the Cosmos XIII, 7-11 July, 2014, Debrecen, Hungary, published in Proceedings of science, http://pos.sissa.it/archive/conferences/204/145/NIC%20XIII_145.pdf |
Files
Article.pdf
(2.5 Mb)
PDF
Publisher Licence URL
https://creativecommons.org/licenses/by-nc-nd/4.0/
Copyright Statement
©Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.
You might also like
Progress on nuclear reaction rates affecting the stellar production of <sup>26</sup>Al
(2023)
Journal Article
Chemical evolution of fluorine in the Milky Way
(2022)
Journal Article
Horizons: nuclear astrophysics in the 2020s and beyond
(2022)
Journal Article
Isotopic ratios for C, N, Si, Al, and Ti in C-rich presolar grains from massive stars
(2022)
Journal Article
Downloadable Citations
About Repository@Hull
Administrator e-mail: repository@hull.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search