The chemical composition of red giants in 47 Tucanae: II. Magnesium isotopes and pollution scenarios - Thygesen, A. O; Sbordone, L; Ludwig, H.-G; Ventura, P; Yong, D; Collet, R; Christlieb, N; Moreno, Jorge Luiz Meléndez; Zaggia, S (Astronomy & Astrophysics, 2016)