SPEAKER: Mucciarelli

TITLE:
Spectroscopic properties of Blue Straggler Stars in Galactic Globular Clusters - Part 1 


ABSTRACT:
In the framework of the COSMIC-LAB project (devoted to unveil the complex 
interplay between dynamics and stellar evolution), we will present the 
results of a spectroscopic campaign recently conducted in 5 Milky Way dense stellar 
systems, namely 47 Tucanae, M4, NGC 6397, M30 and omega Centauri.

From a total of ~200 high-resolution spectra acquired with the ESO-VLT FLAMES spectrograph, 
we derived the kinematical and chemical properties of a large sample of BSS 
in each cluster.

We will discuss the main chemical properties (in particular Fe, C and O abundances) 
of the studied BSS, in comparison with the normal stars of the parent cluster and the 
occurrence of additional mechanisms (as the radiative levitation) able to modify 
the surface chemical composition of the BSS.