With the new estimates on reaction rate uncertainties by the NACRE compilation, the p-capture reactions 17O(p, α) 14N and 17O(p, γ) 18F have virtually no impact on theoretical predictions for stellar mass 1.5 M solar, where core mixing and subsequent envelope mixing interact. The error of the 16O/ 17O prediction is 10-40 per cent depending on the stellar mass, and is persistently dominated by the comparatively small uncertainty of the 16O(p, γ) 17F reaction. ![]() We find that the uncertainty of the 18O(p, α) 15N reaction rate typically causes an error in the theoretical 16O/ 18O ratio of ~= +20/ - 5 per cent. We include seven reaction rates in our systematic analysis of stellar models with initial masses from 1 to 3 M solar. The reaction rates with uncertainties were taken from the NACRE compilation of Angulo et al. Such predictions are important to the interpretation of pre-solar Al 2O 3 grains from meteorites. With this approach we reanalyse the dependence of theoretical oxygen isotopic ratio predictions in first dredge-up red giant branch stars in a systematic way. ![]() The method combines post-processing nucleosynthesis and mixing calculations with a Monte Carlo scheme. We describe a general yet simple method to analyse the propagation of nuclear reaction rate uncertainties in a stellar nucleosynthesis and mixing context.
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