Marino, A. F; Milone, A. P; Casagrande, L; Collet, R; Dotter, A; Johnson, C. I; Lind, K; Bedin, L. R; Jerjen, Helmut; Aparicio, A; Sbordone, L
The globular cluster 47 Tuc exhibits a complex sub-giant branch (SGB) with a faint-SGB comprising only about the 10 per cent of the cluster mass and a bright-SGB hosting at least two distinct populations. We present a spectroscopic analysis of 62 SGB stars including 21 faint-SGB stars. We thus provide the first chemical analysis of the intriguing faint-SGB population and compare its abundances with those of the dominant populations. We have inferred abundances of Fe, representative light...[Show more]
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