Issue |
EPJ Web Conf.
Volume 260, 2022
The 16th International Symposium on Nuclei in the Cosmos (NIC-XVI)
|
|
---|---|---|
Article Number | 09002 | |
Number of page(s) | 11 | |
Section | Galaxy Evolution | |
DOI | https://doi.org/10.1051/epjconf/202226009002 | |
Published online | 24 February 2022 |
https://doi.org/10.1051/epjconf/202226009002
r-Process Contributions to Low-Metallicity Stars
1 Dept. of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
2 GSI Helmholtz Center for Heavy Ion Research, Planckstrasse 1, D-64291 Darmstadt, Germany
3 ZAH, Landessternwarte, University of Heidelberg, Königstuhl 12, D69117 Heidelberg, Germany
4 The Oskar Klein Centre, Department of Astronomy, Stockholm University, Stockholm, Sweden
5 Dept. of Chemistry, Pharmacy & Geosciences, University of Mainz, D-55126 Mainz, Germany
6 Max Planck Institute for Chemistry (Otto Hahn Institute), D-55128 Mainz, Germany
* e-mail: f-k.thielemann@unibas.ch
Published online: 24 February 2022
Various nucleosynthesis studies have pointed out that the rapid neutron capture r-process elements in very metal-poor (VMP) halo stars might have different origins. It has been known that an r-process can either be obtained in neutron-rich low Ye conditions or in high entropy environments [see e.g. 1–5], an overview over many investigations has appeared recently [6]. In the present article we analyze with statistical methods the observational abundance patterns from trans-Fe elements up to the actinides and come to the conclusion that four to five categories of astrophysical events must have contributed. These include the ejection of Fe and trans-Fe elements Sr, Y, Zr (continuing possibly beyond to slightly higher mass numbers) in category 0 events (hereafter "C0"), Fe and weak r-process contributions (including Eu in moderate to slightly larger but varying amounts) in CI and CII events, strong r-process abundance patterns with no or negligible (in comparison to solar) Fe production in CIIIa and CIIIb events, where category CIIIb shows a tendency for an actinide boost behavior. When comparing these categories with presently existing nucleosynthesis predictions, we suggest to identify them (despite remaining uncertainties) with regular core-collapse supernovae, quark deconfinement supernovae, magneto-rotational supernovae, neutron star mergers, and outflows from black hole accretion tori.
© The Authors, published by EDP Sciences, 2022
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