Reaction rate uncertainties and the operation of the NeNa and MgAl chains during HBB in intermediate-mass AGB stars

Abstract

We test the effect of proton-capture reaction rate uncertainties on the abundances of the Ne, Na, Mg and Al isotopes processed by the NeNa and MgAl chains during hot bottom burning (HBB) in asymptotic giant branch (AGB) stars of intermediate mass between 4 and 6 solar masses and metallicities between Z=0.0001 and 0.02. We provide uncertainty ranges for the AGB stellar yields, for inclusion in galactic chemical evolution models, and indicate which reaction rates are most important and should be better determined. We use a fast synthetic algorithm based on detailed AGB models. We run a large number of stellar models, varying one reaction per time for a very fine grid of values, as well as all reactions simultaneously. We show that there are uncertainties in the yields of all the Ne, Na, Mg and Al isotopes due to uncertain proton-capture reaction rates. The most uncertain yields are those of 26Al and 23Na (variations of two orders of magnitude), 24Mg and 27Al (variations of more than one order of magnitude), 20Ne and 22Ne (variations between factors 2 and 7). In order to obtain more reliable Ne, Na, Mg and Al yields from IM-AGB stars the rates that require more accurate determination are: 22Ne(p,g)23Na, 23Na(p,g)24Mg, 25Mg(p,g)26Al, 26Mg(p,g)27Al and 26Al(p,g)27Si. Detailed galactic chemical evolution models should be constructed to address the impact of our uncertainty ranges on the observational constraints related to HBB nucleosynthesis, such as globular cluster chemical anomalies.

accepted for publication on Astronomy & Astrophysics

References in corpus (15)

• First stars VI - Abundances of C, N, O, Li, and mixing in extremely metal-poor giants. Galactic evolution of the light elements
• The Effects of Thermonuclear Reaction Rate Variations on Nova Nucleosynthesis: A Sensitivity Study
• Reaction Rates Uncertainties and the Production of F19 in AGB Stars
• Parameterising the third dredge-up in asymptotic giant branch stars
• Full computation of massive AGB evolution. I. The large impact of convection on nucleosynthesis
• Modelling self-pollution of globular clusters from AGB stars
• Lithium and zirconium abundances in massive Galactic O-rich AGB stars
• Full computation of massive AGB evolution. II. The role of mass loss and cross-sections
• The Uncertainties in the 22Ne + alpha-capture Reaction Rates and the Production of the Heavy Magnesium Isotopes in Asymptotic Giant Branch Stars of Intermediate Mass
• Planetary Nebula Abundances and Morphology: Probing the Chemical Evolution of the Milky Way
• Planetary nebulae abundances and stellar evolution
• Nuclear Reaction Rates and Carbon Star Formation
• On the asymptotic giant branch star origin of peculiar spinel grain OC2
• The Fine-structure Constant as a Probe of Chemical Evolution and AGB Nucleosynthesis in Damped Lyman-alpha Systems
• Oxygen isotopic ratios in first dredge-up red giant stars and nuclear reaction rate uncertainties revisited

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