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The Na-O anticorrelation in horizontal branch stars. V. NGC 6723
R. G. Gratton, S. Lucatello, A. Sollima +7
We used FLAMES+GIRAFFE (Medusa mode) at the VLT to obtain moderately high resolution spectra for 30 red horizontal branch (RHB) stars, 4 RR Lyrae variables, and 17 blue horizontal…
Three discrete groups with homogeneous chemistry along the red giant branch in the globular cluster NGC 2808
Eugenio Carretta
We present the homogeneous reanalysis of Mg and Al abundances from high resolution UVES/FLAMES spectra for 31 red giants in the globular cluster NGC 2808. We found a well defined M…
Searching for Chemical Signatures of Multiple Stellar Populations in the Old, Massive Open Cluster NGC 6791
A. Bragaglia, C. Sneden, E. Carretta +5
Galactic open and globular clusters (OCs, GCs) appear to inhabit separate regions of the age-mass plane. However, the transition between them is not easily defined because there is…
Lithium abundances in globular cluster giants: NGC 6218 (M12) and NGC 5904 (M5)
Valentina D'Orazi, George C. Angelou, Raffaele G. Gratton +5
Convergent lines of evidence suggest that globular clusters host multiple stellar populations. It appears that they experience at least two episodes of star formation whereby a fra…
A sequence of nitrogen-rich very red giants in the globular cluster NGC 1851
Eugenio Carretta, Valentina D'Orazi, Raffaele G. Gratton +1
We present the abundances of N in a sample of 62 stars on the red giant branch (RGB) in the peculiar globular cluster NGC 1851. The values of [N/Fe] ratio were obtained by comparin…
The extreme chemistry of multiple stellar populations in the metal-poor globular cluster NGC 4833
E. Carretta, A. Bragaglia, R. G. Gratton +7
Our FLAMES survey of Na-O anticorrelation in globular clusters (GCs) is extended to NGC 4833, a metal-poor GC with a long blue tail on the horizontal branch (HB). We present the ab…