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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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