Cool stars as tracers of multiple stellar populations in the Galactic globular cluster 47 Tuc

TL;DR

This study investigates the kinematical differences among chemically distinct stellar generations in the globular cluster 47 Tuc, revealing three generations with unique chemical and dynamical properties, advancing understanding of cluster formation.

Contribution

First analysis of kinematical properties of chemically-tagged stellar populations in 47 Tuc, identifying three distinct generations with different chemical and dynamical characteristics.

Findings

Three stellar generations identified with distinct chemical ratios.

Primordial generation stars are less centrally concentrated.

Different generations exhibit varying kinematical temperatures.

Abstract

Although numerous photometric and spectroscopic studies of stars in Galactic globular clusters suggest the existence of several stellar generations in the majority of clusters studied so far, kinematical properties of these stellar generations are still relatively poorly know. In this contribution we present first results of our study of kinematical properties of chemically-tagged stellar populations in the Galactic globular cluster 47 Tuc. Our analysis reveals the existence of three stellar generations in 47 Tuc that are different in their [Li/Na] and [Na/O] ratios. Additionally, we find that the three generations also differ in their kinematical properties: stars belonging to primordial generation are less centrally concentrated and are kinematically hotter than those in the subsequent generations.