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 C-12/C-13. Values of the C-12/C-13 ratio were obtained from a spectrum synthesis analysis. The derived C-12/C-13 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 C-12/C-13, mass, metallicity, and evolutionary status.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/627135 |
| Date | 03 1900 |
| Creators | Szigeti, László, Mészáros, Szabolcs, Smith, Verne V, Cunha, Katia, Lagarde, Nadège, Charbonnel, Corinne, García-Hernández, D A, Shetrone, Matthew, Pinsonneault, Marc, Allende Prieto, Carlos, Fernández-Trincado, J G, Kovács, József, Villanova, Sandro |
| Contributors | Univ Arizona, Steward Observ |
| Publisher | OXFORD UNIV PRESS |
| Source Sets | University of Arizona |
| Language | English |
| Detected Language | English |
| Type | Article |
| Rights | © 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society |
| Relation | http://academic.oup.com/mnras/article/474/4/4810/4655200 |
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