Reaction Rate Uncertainties: NeNa and MgAl in AGB Stars

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dc.creatorIzzard, Robert
dc.creatorLugaro, Maria
dc.creatorIliadis, Christian
dc.creatorKarakas, Amanda
dc.date2006-07-24
dc.date.accessioned2026-07-07T10:23:21Z
dc.date.available2026-07-07T10:23:21Z
dc.descriptionWe 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 Al26 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 Ne22, Na23 and Al26 to be the most susceptible to current nuclear reaction rate uncertainties.
dc.descriptionPresented at NIC-IX, International Symposium on Nuclear Astrophysics - Nuclei in the Cosmos - IX, CERN, Geneva, Switzerland, 25-30 June, 2006
dc.identifierhttps://arxiv.org/abs/astro-ph/0607536
dc.identifierhttp://arxiv.org/abs/astro-ph/0607536
dc.identifierPoSNIC-IX:038,2006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/175798
dc.subjectAstrophysics
dc.titleReaction Rate Uncertainties: NeNa and MgAl in AGB Stars
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