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Meenakshi Purandardas, Aruna Goswami & V. H. Doddamani

Spectroscopic study of the Carbon-Enhanced Metal-Poor star: HE 0110-0406

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Mots-clés : étoiles pauvres en metal, abondances, particularité chimique, nucléosynthèse

Abstract

The halo system of the Milky way comprises the vast majority of the presently observed metal-poor ([Fe/H] <1.0) and very metal-poor ([Fe/H] <2.0) stars. A sizable fraction (~ 30%) of the metal-poor stars with carbon enhancement ([C/Fe] ≤0.7) are called the Carbon-Enhanced Metal-Poor (CEMP) stars. Studies on these objects are of special interest, as they bear the fossil records of nucleosynthesis of the earliest generation of stars. Thus they provide insight into the nucleosynthesis and chemical evolution of the early universe. In the recent past, although these stars have drawn considerable attention as far as their spectroscopic studies are concerned, several questions still remain poorly understood such as the origin, production mechanism(s) and distribution of carbon and neutron-capture elements abundances exhibited by these objects. A comprehensive study of the abundance patterns of various heavy elements in these objects can give important clues to these questions. We have undertaken to perform chemical composition studies of a selected sample of CEMP stars using Hanle Echelle Spectrograph on the 2-m Himalayan Chandra Telescope. In this work, we present abundance results for HE 01100406. Our analysis shows this object to exhibit characteristic properties of CH giants. The abundance distribution patterns and the elemental abundance ratios are critically examined based on existing theories to understand their origin and evolution.

Keywords : metal-poor stars, abundances, chemically peculiar, nucleosynthesis

To cite this article

Meenakshi Purandardas, Aruna Goswami & V. H. Doddamani, «Spectroscopic study of the Carbon-Enhanced Metal-Poor star: HE 0110-0406», 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, 207 - 214 URL : https://popups.uliege.be:443/0037-9565/index.php?id=8849.

About: Meenakshi Purandardas

Indian Institute of Astrophysics, Koramangala, II block, Bangalore, Karnataka, 560034, India and Department of Physics, Bangalore University, Jnana Bharathi Campus, Karnataka, 560056, India.

About: Aruna Goswami

Indian Institute of Astrophysics, Koramangala, II block, Bangalore, Karnataka, 560034, India

About: V. H. Doddamani

Department of Physics, Bangalore University, Jnana Bharathi Campus, Karnataka, 560056, India.