Upper panel: carbon abundance for HE 2229-4153, derived from the CH A2Δ-X2Π (0,0) transitions (G-band). Symbols are the same as in Fig. 3. Lower panel: comparison of the results obtained in this work (red circles) with those previously obtained by Barklem et al. (2005) (crosses). The dashed blue line corresponds to the limit for carbon-enhanced stars, as defined by Aoki et al. (2007).
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