Reaction rate uncertainties: NeNa and MgAl in AGB stars

Robert G. Izzard, Maria Lugaro, Christian Iliadis, Amanda Karakas

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review


We study the effect of uncertainties in the proton-capture reaction rates of the NeNa and MgAl chains on nucleosynthesis due to the operation of hot bottom burning (HBB) in intermediate-mass asymptotic giant branch (AGB) stars. HBB nucleosynthesis is associated with the production of sodium, radioactive 26Al and the heavy magnesium isotopes, and it is possibly responsible for the O, Na, Mg and Al abundance anomalies observed in globular cluster stars. We model HBB with an analytic code based on full stellar evolution models so we can quickly cover a large parameter space. The reaction rates are varied first individually, then all together. This creates a knock-on effect, where an increase of one reaction rate affects production of an isotope further down the reaction chain. We find the yields of 22Ne, 23Na and 26Al to be the most susceptible to current nuclear reaction rate uncertainties.

Original languageEnglish
Title of host publicationProceedings of Science
Subtitle of host publicationInternational Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX
PublisherSissa Medialab, SRL
Number of pages5
Publication statusPublished - 1 Dec 2006
Externally publishedYes
EventInternational Symposium on Nuclear Astrophysics 2006: Nuclei in the Cosmos - IX - Geneva, Switzerland
Duration: 25 Jun 200630 Jun 2006
Conference number: 9th

Publication series

NameProceedings of Science
PublisherSissa Medialab, SRL
ISSN (Print)1824-8039


ConferenceInternational Symposium on Nuclear Astrophysics 2006
Abbreviated titleNIC 2006
Internet address

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