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Shejeelammal Jameela & Aruna Goswami

Probing the Galactic s-process nucleosynthesis using barium stars

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Mots-clés : étoiles, abondance, particularité chimique, nucléosynthèse

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 Å. For HD 36650, we have used the FEROS spectrum at a resolution of 48,000 covering the wavelength region 3520-9200 Å. For HD 207585, the spectrum from VLT/UVES at a resolution of 48,000 covering the wavelength region 3290-6650 Å 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.

Keywords : stars, abundance, chemically peculiar, nucleosynthesis

To cite this article

Shejeelammal Jameela & Aruna Goswami, «Probing the Galactic s-process nucleosynthesis using barium stars», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 88 - Année 2019, Actes de colloques, 2nd Belgo-Indian Network for Astronomy & Astrophysics (BINA) workshop - October 2018 - Brussels, Belgium, 215 - 223 URL : https://popups.uliege.be/0037-9565/index.php?id=8860.

About: Shejeelammal Jameela

Indian Institute of Astrophysics, Koramangala 2nd Block, Bangalore - 560034, India

About: Aruna Goswami

Indian Institute of Astrophysics, Koramangala 2nd Block, Bangalore - 560034, India