AAOmega spectroscopy of 29 351 stars in fields centered on ten Galactic globular clusters

TL;DR

This paper presents a large spectroscopic survey of 29,351 stars in ten Galactic globular clusters, providing stellar parameters and comparing observed velocities with the Besançon Galaxy model, revealing discrepancies.

Contribution

It introduces a dual-pipeline approach for extracting stellar parameters from spectra and calibrates metallicity to [Fe/H], offering comprehensive data for globular cluster studies.

Findings

Calibrated metallicity to [Fe/H] for all stars

Observed velocity dispersions differ from the Besançon Galaxy model

Provided extensive stellar parameters for 29,351 stars

Abstract

Galactic globular clusters have been pivotal in our understanding of many astrophysical phenomena. Here we publish the extracted stellar parameters from a recent large spectroscopic survey of ten globular clusters. A brief review of the project is also presented. Stellar parameters have been extracted from individual stellar spectra using both a modified version of the Radial Velocity Experiment (RAVE) pipeline and a pipeline based on the parameter estimation method of RAVE. We publish here all parameters extracted from both pipelines. We calibrate the metallicity and convert this to [Fe/H] for each star and, furthermore, we compare the velocities and velocity dispersions of the Galactic stars in each field to the Besan\c{c}on Galaxy model. We find that the model does not correspond well with the data, indicating that the model is probably of little use for comparisons with pencil beam survey data such as this.