Spectroscopic Study of Blue Straggler Stars in the Globular Cluster NGC 3201

TL;DR

This study spectroscopically analyzes 39 blue straggler stars in NGC 3201, determining their velocities, atmospheric parameters, and metallicity, and provides the first estimate of magnesium abundance for these stars in this cluster.

Contribution

It presents the first measurement of [Mg/Fe] in blue straggler stars within NGC 3201, expanding understanding of their chemical properties.

Findings

Mean radial velocity of blue stragglers: 498 km/s

Metallicity [Fe/H] of blue stragglers: -1.42 dex

First estimate of [Mg/Fe] for blue stragglers in NGC 3201

Abstract

We conducted a spectroscopic study of 39 blue straggler stars in the globular cluster NGC 3201. The spectra of these stars were collected from the literature. We determined the radial velocity, atmospheric parameters (Teff, log g), and the abundance of Mg, as well as the metallicity ([Fe/H]) of the blue straggler population. The mean radial velocity and [Fe/H] are determined to be 498.0 $\pm$ 5.3 km/s and -1.42 $\pm$ 0.27, respectively, for the blue straggler stars. The derived [Fe/H] is consistent, within uncertainties, with the cluster's [Fe/H] of -1.59 dex. The mean [Mg/Fe] for the blue straggler stars is estimated to be 0.36 $\pm$ 0.73. Importantly, this study first estimates [Mg/Fe] for the blue straggler stars in the cluster NGC 3201.