Nucleosynthesis in Super-AGB Stars

Carolyn L Doherty, Pilar Gil-Pons, Maria Lugaro, Herbert H B Lau, John C Lattanzio, Lionel Siess, Simon Campbell, Ilka Petermann

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

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.
Original languageEnglish
Title of host publicationWhy Galaxies Care about AGB Stars III: A Closer Look in Space and Time
Subtitle of host publicationProceedings of a conference held at University Campus, Vienna, Austria 28 July - 1 August 2014
EditorsF Kerschbaum, R F Wing, J Hron
Place of PublicationSan Francisco CA USA
PublisherAstronomical Society of the Pacific
Pages247-251
Number of pages5
Volume497
ISBN (Electronic)9781583818974
ISBN (Print)9781583818787
Publication statusPublished - 2015
EventConference on Why Galaxies Care about AGB Stars III (2014): A Closer Look in Space and Time - University Campus, Vienna, Austria
Duration: 28 Jul 20141 Aug 2014

Publication series

NameAstronomical Society of the Pacific Conference Series
PublisherAstronomical Society of the Pacific
Volume497

Conference

ConferenceConference on Why Galaxies Care about AGB Stars III (2014)
CountryAustria
CityVienna
Period28/07/141/08/14

Cite this

Doherty, C. L., Gil-Pons, P., Lugaro, M., Lau, H. H. B., Lattanzio, J. C., Siess, L., Campbell, S., & Petermann, I. (2015). Nucleosynthesis in Super-AGB Stars. In F. Kerschbaum, R. F. Wing, & J. Hron (Eds.), Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time: Proceedings of a conference held at University Campus, Vienna, Austria 28 July - 1 August 2014 (Vol. 497, pp. 247-251). (Astronomical Society of the Pacific Conference Series; Vol. 497). Astronomical Society of the Pacific. http://aspbooks.org/custom/publications/paper/497-0247.html