r-Process Contributions to Low-Metallicity Stars

Thielemann, Friedrich-K. and Farouqi, Khalil and Rosswog, Stephan and Kratz, Karl-Ludwig. (2022) r-Process Contributions to Low-Metallicity Stars. In: The 16th International Symposium on Nuclei in the Cosmos (NIC-XVI), 260. 09002.

PDF - Published Version
Available under License CC BY (Attribution).


Official URL: https://edoc.unibas.ch/92930/

Downloads: Statistics Overview


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.
Faculties and Departments:05 Faculty of Science > Departement Physik > Former Organization Units Physics > Theoretische Physik Astrophysik (Thielemann)
UniBasel Contributors:Thielemann, Friedrich-Karl
Item Type:Conference or Workshop Item, refereed
Conference or workshop item Subtype:Conference Paper
Publisher:EDP Sciences
Series Name:EPJ Web of Conferences
Note:Publication type according to Uni Basel Research Database: Conference paper
Identification Number:
edoc DOI:
Last Modified:15 Feb 2023 08:47
Deposited On:15 Feb 2023 08:47

Repository Staff Only: item control page