In 47 Tuc, C and N abundances fall at the sub-giant branch during the first dredge-up, and the optical CMD is best fitted by two isochrones differing in metallicity, helium, and age.
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C and N abundances in globular clusters. I. The case of 47 Tuc and the effect of the first dredge-up
In 47 Tuc, C and N abundances fall at the sub-giant branch during the first dredge-up, and the optical CMD is best fitted by two isochrones differing in metallicity, helium, and age.