Evolution and Nucleosynthesis of Extremely Metal-Poor AGB Stars

Details Evolution and Nucleosynthesis of Extremely Metal-Poor AGB Stars Evolution and Nucleosynthesis of Extremely Metal-Poor AGB Stars

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aspc..445...23s&link_type=abstract

Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants. Proceedings of a conference held at University Ca

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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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