Probing the Galactic s-process nucleosynthesis using barium stars

TL;DR

This study investigates the Galactic s-process nucleosynthesis by analyzing the chemical compositions of three barium stars through high-resolution spectroscopy, revealing enrichment from former companion AGB stars and discussing nucleosynthesis theories.

Contribution

It provides new high-resolution spectroscopic data on three barium stars, enhancing understanding of s-process element enrichment and its relation to AGB star nucleosynthesis in our Galaxy.

Findings

Barium stars show s-process element enrichment from companion AGB stars.

Spectroscopic analysis confirms surface chemical composition enrichment.

Results support existing nucleosynthesis models for s-process elements.

Abstract

The origin and evolution of neutron-capture elements in our Galaxy is poorly understood. In this work, we have attempted to understand the Galactic s-process nucleosynthesis using barium stars as probes. We have performed high resolution spectroscopic analysis for three barium stars HD 36650, HD 207585 and HD 219116. The analysis of HD 219116 is based on HCT/HESP data at a resolution of 60,000 covering a wavelength region 3530-9970 {\rm \AA}. For HD 36650, we have used the FEROS spectrum at a resolution of 48,000 covering the wavelength region 3520-9200 {\rm \AA}. For HD 207585, the spectrum from VLT/UVES at a resolution of 48,000 covering the wavelength region 3290-6650 {\rm \AA} is used. Our analysis clearly shows that the surface chemical composition of these barium stars are enriched by s-process nucleosynthesis products coming from their former companion low-mass AGB stars. A discussion on the distribution of abundance ratios based on the existing nucleosynthesis theories is presented.