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

A. Kucinskas, V. Dobrovolskas, P. Bonifacio

Published 2014-09-10Version 1

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.