Van Eck, Sophie ; Giribaldi, Riano ; Merle, Thibault ; Lambotte, Adrian ; Karinkuzhi, Drisya ; Goriely, Stéphane ; Choplin, Arthur ; Storm, Nicholas ; Gerber, Jeffrey ; Siess, Lionel ; Bergemann, Maria ; Jorissen, Alain

published in Galaxies, 12 issue 6 (2024)

Abstract: Separating stars enriched in the s- and r-processes of nucleosynthesis is usually achieved by analyzing the element ratios of s-process elements (like Ba or La) to r-process elements (like Eu). The situation becomes more complex when analyzing CEMP-rs stars, which are carbon-enriched metal-poor objects enriched in a mixture of s- and r-elements. These objects, possibly resulting from the i-process of nucleosynthesis, are notoriously difficult to classify based on elemental ratios. Recent theoretical studies have outlined, however, that the s-, i-, and r-processes produce distinct isotopic mixtures. Here, we propose to analyze a sample of stars known to be enriched in s, r, or r + s elements and to determine the odd-to-even isotopic ratio measured on atomic lines of barium, in order to validate or disprove their assignation.

Keyword(s): nucleosynthesis ; metal-poor stars ; i-process
DOI: 10.3390/galaxies12060089
Links: link
Funding: BELSPO/FED-tWIN Prf-2020-033 BISTRO/FED-tWIN Prf-2020-033 BISTRO