| |
 |
| Paper: |
Nucleosynthesis in Super-AGB Stars |
| Volume: |
497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time |
| Page: |
247 |
| Authors: |
Doherty, C. L.; Gil-Pons, P.; Lugaro, M.; Lau, H. H. B.; Lattanzio, J. C.; Siess, L.; Campbell, S. W.; Petermann, I. |
| Abstract: |
Super-AGB stars reside in the mass range ∼ 6.5–10 M☉ and
are characterised by off-center carbon ignition prior to a thermally
pulsing super-AGB phase. These stars can undergo from many tens to
even thousands of thermal pulses and experience extreme nucleosynthetic
conditions, with temperatures both at the base of the convective
envelope and within the helium-burning intershell regions far higher
than in their lower-mass counterparts. This can result in interesting
nucleosynthesis from extreme hot bottom burning and also different
heavy-element distributions caused by the high neutron density
generated within the thermal pulse, with this material later mixed to
the surface during third dredge-up events. We discuss recent
nucleosynthetic yield results for super-AGB stars over the range of
metallicity Z = 0.02 × 10–5 ([Fe/H] ∼ 0 to –3.3),
and present a small suite of heavy element super-AGB star yield
predictions. We also apply our nucleosynthetic results to examine the
possible role of super-AGB stars as polluters of the anomalous stars
within globular clusters. |
|
|
|
|
|
