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An aluminium tool for multiple stellar generations in the globular clusters 47 Tuc and M 4
Eugenio Carretta, Raffaele Gratton, Angela Bragaglia +2
We present aluminium abundances for a sample of about 100 red giant stars in each of the Galactic globular clusters 47 Tuc (NGC 104) and M 4 (NGC 6121). We have derived homogeneous…
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…
Signatures of an intermediate-age metal-rich bulge population
T. Bensby, S. Feltzing, A. Gould +8
We have determined detailed elemental abundances and stellar ages for a sample of now 38 microlensed dwarf and subgiant stars in the Galactic bulge. Stars with sub-solar metallicit…
The Na-O anticorrelation in horizontal branch stars. II. NGC1851
R. G. Gratton, S. Lucatello, E. Carretta +6
We studied the Na-O anti-correlation from moderately high resolution spectra for 35 stars on the blue HB (BHB), one RR Lyrae, and 55 stars are on the red HB (RHB) of NGC1851. We al…