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Fig. 2.


Top panel: [N/Fe] as a function of 12C/13C, represented for our programme stars with full and open blue squares; open blue squares specifically identify the N-enriched objects (HD 43389, HD 60197, HD 100503, and to a lesser extent HD 121447). Arcturus (green star) and V762 Cas (green triangle) are also shown for comparison. The horizontal dotted line shows the abundance ratio expected in red giant stars after the mixing processes occurring along the giant branch (Eggleton et al. 2008). Bottom panel: Same as the top panel for the C abundance (by number, in the scale where log ϵH = 12).

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