Na-O Anticorrelation and HB. IV. Detection of He-rich and He-poor stellar populations in the globular cluster NGC 6218

@article{Carretta2007NaOAA,
  title={Na-O Anticorrelation and HB. IV. Detection of He-rich and He-poor stellar populations in the globular cluster NGC 6218},
  author={Eugenio Carretta and Angela Bragaglia and Raffaele Gratton and G. Catanzaro and Francesco Leone and Elena Sabbi and Santi Cassisi and Riccardo Claudi and Francesca D’Antona and P. François and Gael James and Giampaolo Piotto},
  journal={Astronomy and Astrophysics},
  year={2007}
}
. We used the multifiber spectrograph FLAMES on the ESO Very Large Telescope UT2 to derive atmospheric parameters, metallicities and abundances of O and Na for 79 red giant stars in the Galactic globular cluster NGC 6218 (M 12). We analyzed stars in the magnitude range from about 1 mag below the bump to the tip of the Red Giant Branch. The average metallicity we derive is [Fe/H]= − 1 . 31 ± 0 . 004 ± 0 . 028 dex (random and systematic errors, respectively), with a very small star-to-star scatter… 
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