| Name: | Drisya Karinkuzhi |
| Affiliation: | University of Calicut |
| Conference ID : | ASI2024_326 |
| Title : | The intermediate neutron-capture process at near solar metallicities |
| Authors : | Drisya Karinkuzhi (1,2), Sophie Van Eck (2), Alain Jorissen (2), Stephane Goriely (2), Lionel Siess (2), Thibault Merle (2) , Arthur Choplin (2) |
| Authors Affiliation: | (1). Department of Physics, University of Calicut, Thenhipalam, Malappuram, Kerala 673635
(2). Institute of Astronomy and Astrophysics, University of Brussels, 1050 Brussels, Belgium |
| Mode of Presentation: | Poster |
| Abstract Category : | Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Abstract : | The origin of Carbon-Enhanced Metal-Poor stars enriched with both slow (s-) and rapid (r-) neutron-capture elements, the so-called CEMP_rs stars, is still debated. A variety of scenarios have been proposed, but the intermediate neutron-capture process (i-process) occurring at conditions intermediate to those required by the s-process and r-process is accepted as the most likely origin of these double enrichment. However, potential astrophysical sites still need to be explored. Our recent analysis (Karinkuzhi et al. 2021a) showed that low-metallicity very low-mass TPAGB stars are a potential site for the i-process, thus explaining the observed abundances in CEMP-rs stars. In light of this, another exotic site may not be necessary to explain the abundance of rs stars at lower metallicities. But this does not mean that it is the only site possible today that is hosting an i-process with such neutron densities. Moreover, previous studies including ours (Karinkuzhi et al. 2018) reported the signatures of the i-process even at comparatively high metallicity ([Fe/H > -1.0) which put a strong constraint on the occurrence of the i-process, which is not limited to very low-metallicity environments. We recently analyzed a sample of rs-enriched stars at higher metallicities. Through this analysis, we proposed that the i-process can also be invoked under certain conditions in high metallicity TPAGB stars (Karinkuzhi et al. 2023), thus explaining the observed rs-enrichment at higher metallicities. The details about these analyses as well as the nature of the i-process at various metallicities will be discussed during the meeting. |
