| Name: Keerthy M V |
| Affiliation: University of Calicut, Kerala |
| Conference ID: ASI2026_803 |
| Title: Diversity of r-process Nucleosynthesis: Abundance Signatures of the Limited r-process in carbon-enriched and carbon-normal metal-poor stars |
| Abstract Type: Poster |
| Abstract Category: Stars, Interstellar Medium, and Astrochemistry in Milky Way |
| Author(s) and Co-Author(s) with Affiliation: M. V. Keerthy(Department of Physics, University of Calicut, Malappuram-673635, India), D. Karinkuzhi(1. Department of Physics, University of Calicut, Malappuram 673635, India 2. Institut d’Astronomie et d’Astrophysique, Universit), S. Van Eck(Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles (ULB) C.P. 226, B-1050 Bruxelles, Belgium) |
| Abstract: More than fifty percent of the elements in the Universe heavier than iron are created via the rapid neutron-capture process (r-process), whereas the slow neutron-capture process (s-process) makes up the remaining fifty percent. Though the main astrophysical sites of the r- and s-processes are generally understood, a fraction of metal-poor stars shows neutron-capture abundance patterns that differ from the traditional abundance signatures. Particularly, a rare subgroup of r-process-enhanced stars show elevated first-peak elements (Sr, Y, Zr), along with high [Sr/Eu] and [Sr/Ba] and low [Eu/Fe], as opposed to the majority of r-process stars in which first-peak elements are reduced relative to Eu. This distinction indicates that the light neutron-capture elements possibly originated from a nucleosynthetic site different from that accountable for the creation of the second and third r-process peaks. This mechanism, frequently referred to as the limited r-process, is considered to operate under conditions of
reasonably low neutron flux. In this study, we present a detailed abundance analysis of a sample of limited r-process stars, estimating light and heavy neutron-capture element abundances subject to non-local thermodynamic equilibrium (NLTE) conditions. In addition We compare their abundance patterns with those of carbon-enhanced metal-poor with no/mild enrichments of heavy elements (the so-called CEMP-no stars), as some of these stars also display the signatures of limited r-process. We present the results from this analysis offering novel restrictions on the diversity of r-process forming sites in the earlier Galaxy. |
