CNONa and 12 C / 13 C in giant stars of 10 open clusters ⋆


Context. Evolved low-mass stars (0.8 ≤ M/M ⊙ ≤ 2.5) of a wide range of metallicity bear signatures of a non-standard mixing event in their surface abundances of Li, C, and N, and in their 12 C/ 13 C ratio. A Na overabundance has also been reported in some giants of open clusters but remains controversial. The cause of the extra-mixing has been attributed to… (More)


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