From the <i>s</i>-Process to the <i>i</i>-Process: A New Perspective on the Chemical Enrichment of Extrinsic Stars

From the <i>s</i>-Process to the <i>i</i>-Process: A New Perspective on the Chemical Enrichment of Extrinsic Stars

Separating stars enriched in the <i>s</i>- and <i>r</i>-processes of nucleosynthesis is usually achieved by analyzing the element ratios of <i>s</i>-process elements (like Ba or La) to <i>r</i>-process elements (like Eu). The situation becomes more com...

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Bibliographic Details
Main Authors:	Sophie Van Eck, Riano Giribaldi, Thibault Merle, Adrian Lambotte, Drisya Karinkuzhi, Stéphane Goriely, Arthur Choplin, Nicholas Storm, Jeffrey Gerber, Lionel Siess, Maria Bergemann, Alain Jorissen
Format:	Article
Language:	English
Published:	MDPI AG 2024-12-01
Series:	Galaxies
Subjects:	nucleosynthesis metal-poor stars <i>i</i>-process
Online Access:	https://www.mdpi.com/2075-4434/12/6/89
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Summary:	Separating stars enriched in the <i>s</i>- and <i>r</i>-processes of nucleosynthesis is usually achieved by analyzing the element ratios of <i>s</i>-process elements (like Ba or La) to <i>r</i>-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>i</i>-process of nucleosynthesis, are notoriously difficult to classify based on elemental ratios. Recent theoretical studies have outlined, however, that the <i>s</i>-, <i>i</i>-, and <i>r</i>-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.
ISSN:	2075-4434