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Carbon isotope ratios, along with carbon and nitrogen abundances, are derivedin a sample of 11 red-giant members of one of the most metal-rich clusters inthe Milky Way, NGC 6791. The selected red-giants have a mean metallicity andstandard deviation of [Fe/H]=+0.39+-0.06 (Cunha et al. 2015). We used highresolution H-band spectra obtained by the SDSS-IV Apache Point ObservatoryGalactic Evolution Experiment (APOGEE). The advantage of using high-resolutionspectra in the H-band is that lines of CO are well represented and their lineprofiles are sensitive to the variation of 12C/13C. Values of the 12C/13C ratiowere obtained from a spectrum synthesis analysis. The derived 12C/13C ratiosvaried between 6.3 and 10.6 in NGC 6791, in agreement with the final isotopicratios from thermohaline-induced mixing models. The ratios derived here arecombined with those obtained for more metal poor red-giants from the literatureto examine the correlation between 12C/13C, mass, metallicity and evolutionarystatus.

12C/13C isotopic ratios in red-giant stars of the open cluster NGC 6791