Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..378....9s&link_type=abstract
Why Galaxies Care About AGB Stars: Their Importance as Actors and Probes. ASP Conference Series, Vol. 378, proceedings of the co
Astronomy and Astrophysics
Astronomy
5
Scientific paper
The evolution and nucleosynthesis of stars in the mass range ˜ 7 - 11 Msun is reviewed. The main evolutionary features can be summarized as follows: off-center carbon ignition followed by the propagation of a flame to the center, formation of a neon-oxygen core and subsequent development of recurrent instabilities in the helium burning shell during the so-called thermally pulsing super-AGB (SAGB) phase. Our analysis of the pulse properties and nucleosynthesis show that owing to large dilution factors, the surface modifications induced by third dredge-up episodes are weak. The chemical imprint of SAGB stars mainly results from the action of hot-bottom burning, namely a large production of 13C, 14N, 25Mg, 26Al and potentially of 23Na. We also briefly describe how the mass range where SAGB stars lie depends on the metallicity.
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