Bibcode
Szigeti, L.; Mészáros, Szabolcs; Smith, Verne V.; Cunha, Katia; Lagarde, Nadège; Charbonnel, Corinne; García-Hernández, D. A.; Shetrone, Matthew; Pinsonneault, Marc; Allende Prieto, C.; Fernández-Trincado, J. G.; Kovács, József; Villanova, Sandro
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 474, Issue 4, p.4810-4817
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3
2018
Citations
15
Refereed citations
15
Description
Carbon isotope ratios, along with carbon and nitrogen abundances, are
derived in a sample of 11 red-giant members of one of the most
metal-rich clusters in the Milky Way, NGC 6791. The selected red-giants
have a mean metallicity and standard deviation of [Fe/H] = +0.39
± 0.06 (Cunha et al. 2015). We used high-resolution H-band
spectra obtained by the SDSS-IV Apache Point Observatory Galactic
Evolution Experiment. The advantage of using high-resolution spectra in
the H band is that lines of CO are well represented and their line
profiles are sensitive to the variation of
12C/13C. Values of the
12C/13C ratio were obtained from a spectrum
synthesis analysis. The derived 12C/13C ratios
varied between 6.3 and 10.6 in NGC 6791, in agreement with the final
isotopic ratios from thermohaline-induced mixing models. The ratios
derived here are combined with those obtained for more metal poor
red-giants from the literature to examine the correlation between
12C/13C, mass, metallicity, and evolutionary
status.
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