The metal-poor end of the Spite plateau. II. Detailed chemical investigation

TL;DR

This paper provides a detailed chemical and kinematic analysis of 11 metal-poor dwarf stars, revealing elemental anomalies and insights into early universe star formation and evolution.

Contribution

It offers new detailed chemical abundances and orbital properties of metal-poor stars, enhancing understanding of the early universe and stellar evolution.

Findings

Some stars show low lithium content.

Elemental anomalies observed in certain stars.

Kinematic data suggest diverse stellar origins.

Abstract

Context. The study of old, metal-poor stars deepens our knowledge on the early stages of the universe. In particular, the study of these stars gives us a valuable insight into the masses of the first massive stars and their emission of ionising photons. Aims. We present a detailed chemical analysis and determination of the kinematic and orbital properties of a sample of 11 dwarf stars. These are metal-poor stars, and a few of them present a low lithium content. We inspected whether the other elements also present anomalies. Methods. We analysed the high-resolution UVES spectra of a few metal-poor stars using the Turbospectrum code to synthesise spectral lines profiles. This allowed us to derive a detailed chemical analysis of Fe,