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Carbon isotope ratios along the giant branch of M67
Abstract
The carbon isotope ratio in the giant branch stars of the open cluster M67 was studied in order to determine at what stage in the evolutionary sequence a star departs from standard evolution and undergoes excess surface mixing that has been observed in low-mass stars. The results show that the subgiants seem to have undergone little or no mixing. The lower giant branch stars exhibit normal 'fist dredge-up' mixing ratios. The 'tip' giants and the 'clump' giants exhibit ratios considerably lower than predicted by standard mixing theories. Mixing on the giant branch caused by meridional circulation currents due to stellar rotation could have caused additional CN-processed elements to be mixed to the surface. This mixing would have occurred after the standard mixing phase and before the He-core flash.
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Gilroy & Brown (1991) found that the ratios of C/N and 12C/13C at the onset of the first dredge-up matched the models quite well.
“Gilroy & Brown (1991) found that the ratios of C/N and 12 C/ 13 Cat the onset of the FDU matched the models quite well”
From The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars (2014) · cites this paper as Gilroy & Brown 1991
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The Dawes Review 2: Nucleosynthesis and Stellar Yields of Low- and Intermediate-Mass Single Stars
Karakas, A. I., & Lattanzio, J. C. (2014) · Publications of the Astronomical Society of Australia · doi:10.1017/pasa.2014.21 · Cited by 735
“…one of the few isotopic ratios that can be readily derived from stellar spectra which means that there are large samples of stars for comparison to theoretical calculations (e.g., Gilroy & Brown 1991; Gratton et al. 2000; Smiljanic et al. 2009; Mikolaitis et al. 2010; Tautvaǐsienė et al. 2013).”
BackgroundNucleosynthesis of Light-Element Isotopes in Evolved Stars Experiencing Extended Mixing
Palmerini, S., Busso, M., Maiorca, E., & Guandalini, R. (2009) · Publications of the Astronomical Society of Australia · doi:10.1071/as08040 · Cited by 31
Metadata
- Authors
- Gilroy, K. K., & Brown, J. A.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1991-04
- Volume
- 371
- Pages
- 578
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W2000556139
- Cited by
- 162
- References
- 0
- Citations by year
- 2026: 3 · 2025: 3 · 2024: 3 · 2023: 5 · 2022: 1 · 2021: 4 · 2020: 1 · 2019: 4 · 2018: 3 · 2017: 6 · 2016: 11 · 2015: 4 · 2014: 6 · 2013: 3 · 2012: 5
- FWCI
- 0.00
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- The Astrophysical Journal (publishedVersion)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Keywords
- carbon isotope ratio, M67, giant branch stars, open clusters, subgiants, surface mixing, first dredge-up, meridional circulation, stellar rotation, core helium flash, stellar evolution
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