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Paper: Evolution and Nucleosynthesis of Extremely Metal–Poor AGB Stars
Volume: 445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants
Page: 23
Authors: Straniero, O.; Cristallo, S.; Piersanti, L.; Gallino, R.; Domínguez, I.; Bisterzo, S.
Abstract: When the metallicity Z is lower than a few times 10–5, the scarcity of CNO nuclei and the consequent weakness of the H-burning shell lead to important deviations from the canonical evolutionary scenario for low-mass AGB stars. In particular, thermal pulses are stronger, the third dredge-up is deeper and, most important, the first fully developed thermal pulse may generate a convective zone capable of capturing protons from the overlaying H-rich layers, causing a violent H-burning thermonuclear runaway. Based on full-network stellar evolution calculations, we discuss the consequences of this occurrence.
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