On the influence of multiple stellar populations in globular clusters on their medium-resolution integrated-light spectra

TL;DR

This study investigates how multiple stellar populations in globular clusters influence their medium-resolution integrated-light spectra, revealing chemical abundance variations and evolutionary signatures.

Contribution

It provides new insights into the chemical evolution and spectral signatures of multiple stellar populations in globular clusters using integrated-light spectral analysis.

Findings

Carbon abundances change gradually during cluster evolution

Helium, C, O, Mg, and Na abundance anomalies are detected in spectra

Spectral signatures of multiple populations are identified

Abstract

We take a closer look at our published results of determination of ages, metallicities, helium mass fractions and abundances of chemical elements in Galactic globular clusters in order to find possible signatures of the phenomenon of multiple stellar populations in these data. Our analysis reveals that carbon abundances in the atmospheres of stars in the studied clusters change gradually during their evolution. The changes of the helium mass fraction and C, O, Mg and Na abundance anomalies caused by the effect of multiple stellar populations on the analyzed integrated-light spectra are detected through the comparison of our results with models of chemical evolution and literature data for Galactic field stars.