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Home 2023 Does the i-process operate at nearly solar metallicity?

Does the i-process operate at nearly solar metallicity?

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Published on 31 August 2023

Vol. 677
8. Stellar atmospheres

Does the i-process operate at nearly solar metallicity?

by D. Karinkuzhi, S. Van Eck, S. Goriely, L. Siess, A. Jorissen, A. Choplin, A. Escorza, S. Shetye, and H. Van Winckel 2023, A&A, 677, A47

This paper presents a high-resolution spectroscopic analysis of 15 s-process rich candidates with close-to-solar metallicity. The authors found that two stars of their sample are enriched in both r- and s-process elements, with an abundance pattern compatible with i-process nucleosynthesis which is efficient in polluting asymptotic giant branch (AGB) star companions. If the i process is indeed active in objects such as AGB stars with a close-to-solar metallicity, an important impact on nucleosynthesis and galactic chemical evolution can be expected. In particular, the i-process contribution to our Solar System would need to be revisited.