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Terzan 8: a Sagittarius-flavoured globular cluster
Eugenio Carretta, Angela Bragaglia, Raffaele G. Gratton +3
Massive globular clusters (GCs) contain at least two generations of stars with slightly different ages and clearly distinct light elements abundances. The Na-O anticorrelation is t…
NGC 5694: another foster son of the Galactic Halo
A. Mucciarelli, M. Bellazzini, M. Catelan +5
We present the results of the analysis of high-resolution spectra obtained with UVES-FLAMES@VLT for six red giant branch stars in the outer-halo metal-poor ([Fe/H]I=-1.98 and [Fe/H…
Rubidium abundances in the globular clusters NGC 6752, NGC 1904 and NGC 104 (47 Tuc)
Valentina D'Orazi, Maria Lugaro, Simon W. Campbell +5
Large star-to-star variations of the abundances of proton-capture elements, such as Na and O, in globular clusters (GCs) are interpreted as the effect of internal pollution resulti…
NGC 362: another globular cluster with a split red giant branch
E. Carretta, A. Bragaglia, R. G. Gratton +7
We obtained FLAMES GIRAFFE+UVES spectra for both first and second-generation red giant branch (RGB) stars in the globular cluster (GC) NGC 362 and used them to derive abundances of…
Sodium content as a predictor of the advanced evolution of globular cluster stars
Simon W. Campbell, Valentina D'Orazi, David Yong +6
The asymptotic giant branch (AGB) phase is the final stage of nuclear burning for low-mass stars. Although Milky Way globular clusters are now known to harbour (at least) two gener…
On the internal pollution mechanisms in the globular cluster NGC 6121 (M4): heavy-element abundances and AGB models
Valentina D'Orazi, Simon W. Campbell, Maria Lugaro +3
Globular clusters display significant variations in their light-element content, pointing to the existence of a second stellar generation formed from the ejecta of an earlier gener…