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Fluorine variations in the globular cluster NGC 6656 (M22): implications for internal enrichment timescales
Valentina D'Orazi, Sara Lucatello, Maria Lugaro +8
Observed chemical (anti)correlations in proton-capture elements among globular cluster stars are presently recognized as the signature of self-enrichment from now extinct, previous…
Searching for multiple stellar populations in the massive, old open cluster Berkeley 39
A. Bragaglia, R. G. Gratton, E. Carretta +3
The most massive star clusters include several generations of stars with a different chemical composition (mainly revealed by an Na-O anti-correlation) while low-mass star clusters…
A long-period massive planet around HD106515A
S. Desidera, R. Gratton, E. Carolo +9
We have performed RV monitoring of the components of the binary system HD 106515 over about 11 years using the high resolution spectrograph SARG at TNG. The primary shows long-peri…
Spectroscopic hint of a cold stream in the direction of the globular cluster NGC 1851
A. Sollima, R. G. Gratton, J. A. Carballo-Bello +5
We present the results of a spectroscopic survey performed in the outskirts of the globular cluster NGC1851 with VIMOS@VLT. The radial velocities of 107 stars in a region between 1…
Aluminum abundances of multiple stellar generations in the globular cluster NGC 1851
Eugenio Carretta, Valentina D'Orazi, Raffaele G. Gratton +1
We study the distribution of aluminum abundances among red giants in the peculiar globular cluster NGC 1851. Aluminum abundances were derived from the strong doublet Al I 8772-8773…
Spectroscopic analysis of the two subgiant branches of the globular cluster NGC1851
R. G. Gratton, S. Villanova, S. Lucatello +5
NGC1851 possibly shows a spread in [Fe/H], but the relation between this spread and the division in the SGB is unknown. We obtained blue (3950-4600 A) intermediate resolution (R~8,…