Third Dredge-Up in globular cluster AGB stars: Observation versus theory

被引：0
|
作者：
Lederer, Michael T. [1 ]
Lebzelter, Thomas [1 ]
Cristallo, Sergio [2 ]
Straniero, Oscar [2 ]
Aringer, Bernhard [1 ]
Hinkle, Ken [3 ]
机构：
[1] Univ Vienna, Dept Astron, Turkenschanzstr 17, A-1180 Vienna, Austria
[2] Osservatorio Astron Collurania, INAF, I-64100 Teramo, Italy
[3] Natl Opt Astron Observ, Tucson, AZ 85726 USA
来源：
UNSOLVED PROBLEMS IN STELLAR PHYSICS: A CONFERENCE IN HONOUR OF DOUGLAS GOUGH | 2007年 / 948卷
关键词：
stars : AGB; stars : evolution; globular clusters; molecular opacities;
D O I：
暂无
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 C-12/C-13 from high-resolution near-infrared spectra of a number of AGB stars in the globular cluster NGC 1946 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.
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收藏
页码：43 / +
页数：2
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