Blue straggler stars in Globular Clusters: chemical and kinematical properties

TL;DR

This study investigates the chemical compositions and rotational velocities of Blue Straggler stars across multiple globular clusters to understand their origins and evolution.

Contribution

It provides new spectroscopic data on Blue Straggler stars in M4, ω Centauri, and M30, enhancing understanding of their properties in different cluster environments.

Findings

Blue Straggler stars show diverse chemical abundances.

Rotational velocities vary among clusters.

Results suggest different formation mechanisms.

Abstract

Blue Straggler stars are present in all the properly observed Globular Clusters. They mimic a rejuvenated stellar population and their existence has been a puzzle for many years. We performed an extensive spectroscopic survey of the surface abundances and the rotational velocities of Blue Straggler stars in different Globular Clusters, by using the high-resolution spectrograph FLAMES@VLT in the UVES+GIRAFFE combined mode. In this contribution we show our main results obtained for M4, {\omega} Centauri and M30.