Physics
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..948...43l&link_type=abstract
UNSOLVED PROBLEMS IN STELLAR PHYSICS: A Conference in Honor of Douglas Gough. AIP Conference Proceedings, Volume 948, pp. 43-50
Physics
Globular Clusters In The Milky Way, Giant And Subgiant Stars, Stellar Structure, Interiors, Evolution, Nucleosynthesis, Ages, Stellar Atmospheres, Radiative Transfer, Opacity And Line Formation
Scientific paper
The changes in the surface abundances of Asymptotic Giant Branch (AGB) stars are due to ongoing nucleosynthesis in the stellar interior accompanied by strong mixing events. Quantitative details of the mixing mechanism - commonly dubbed Third Dredge-Up (TDU) - are still unclear. We derive the C/O ratio and the carbon isotopic ratio 12C/13C from high-resolution near-infrared spectra of a number of AGB stars in the globular cluster NGC 1846 in the Large Magellanic Cloud (LMC). Our sample is well defined in metallicity and mass which allows us to trace the TDU along the AGB as a function of luminosity. Supplementary, we compare the experimentally derived values to results from stellar evolution models. For these calculations we use a set of newly generated opacity coefficients which properly take into account the carbon (and nitrogen) enhancement caused by the third dredge-up.
Aringer Bernhard
Cristallo Sergio
Hinkle Ken
Lebzelter Thomas
Lederer Michael T.
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