Abstract Details

Name: Pallavi Saraf
Affiliation: Indian Institute of Astrophysics
Conference ID: ASI2021_511
Title : Exploring the origin and formation sites of r-process rich metal poor stars
Authors and Co-Authors : Pallavi Saraf(IIA); Sivarani Thirupathi(IIA) ; Avrajit Bandyopadhyay(ARIES)
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : Nearly half of the elements beyond the iron peak in the periodic table are expected to have been made through rapid neutron capture process (r-process). However, the astrophysical sites of the r-process are not well known. Mergers of neutron stars are thought to be potential sites for r-process production. However, the presence of r-process rich, very metal-poor stars in the Halo and Milky Way satellite galaxies require r-process production at a very early time in the Galaxy, well before the NS-merger evolution timescales. Here, we present a study of the detailed chemical abundances of four relatively bright r-process enhanced stars initially studied by Bandyopadhyay et al. (2020). In this study, we use high signal-to-noise spectra using the 10-m Gran Telescopio CANARIAS (GTC) Spain, which has enabled us to connect the abundances of lighter elements with that of the elements at different r-process peaks. We also present a possible connection between different classes (r-I, r-II, and limited-r) of r-process rich metal-poor stars to understand the origin of r-process in the early Milky Way.