Na-O anticorrelation and HB

We present abundances of Fe, Na, and O for 1409 red giant stars in 15 galactic globular clusters (GCs), derived from the homogeneous analysis of high-resolution FLAMES/GIRAFFE spectra. Combining the present data with results from our FLAMES/UVES spectra and from previous studies within the project, we obtained a total sample of 1958 stars in 19 clusters, the largest and most homogeneous database of this kind to date. The programme clusters cover a range in metallicity from [Fe/H] dex to [Fe/H] dex, with a wide variety of global parameters (morphology of the horizontal branch, mass, concentration, etc.). For all clusters we find the Na-O anticorrelation, the classical signature of the operation of…

• NS
  National Science Foundation
• NA
  National Aeronautics and Space Administration
• CI
  California Institute of Technology
• DF
  Deutsche Forschungsgemeinschaft
• MD
  Ministero dell’Istruzione, dell’Università e della Ricerca