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J/A+A/466/641  Reaction rates of NeNa-MgAl chains in AGB stage (Izzard+, 2007)

Reaction rate uncertainties and the operation of the NeNa and MgAl chains during HBB in intermediate-mass AGB stars. Izzard R.G., Lugaro M., Karakas A.I., Iliadis C., van Raai M. <Astron. Astrophys. 466, 641 (2007)> =2007A&A...466..641I
ADC_Keywords: Atomic physics ; Models, evolutionary Keywords: nuclear Reactions, nucleosynthesis, abundances - stars: AGB and post-AGB 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 6M 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. Description: 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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table13.dat 97 576 Complete results for a relatively small subset of synthetic models obtained by varying only the six most uncertain reactions between their upper and lower limits table13.tex 83 9450 LaTeX version of table13
Byte-by-byte Description of file: table13.dat
Bytes Format Units Label Explanations
1- 2 A2 --- --- [M=] 3 I1 solMass Mass [4/6] Model initial mass (1) 5- 6 A2 --- --- [Z=] 7- 12 F6.4 --- Z Model initial Z abundance (1) (0.0001, 0.004, 0.008, 0.02) 14- 15 A2 --- r1 [UL] 22Ne(p,γ)23Na reaction upper (UL) or lower (LL) limit 17- 18 A2 --- r2 [UL] 23Na(p,γ)24Mg reaction upper (UL) or lower (LL) limit 20- 21 A2 --- r3 [UL] 23Na(p,α)20Ne reaction upper (UL) or lower (LL) limit 23- 24 A2 --- r4 [UL] 25Mg(p,γ)26Al->26^Mg reaction upper (UL) or lower (LL) limit 26- 27 A2 --- r5 [UL] 26Mg(p,γ)27Al reaction upper (UL) or lower (LL) limit 29- 30 A2 --- r6 [UL] 26Al(p,γ)27Si->27Al reaction upper (UL) or lower (LL) limit 32- 37 F6.4 --- 20Ne ^20^Ne yield relative to control value (2) 39- 44 F6.4 --- 21Ne ^21^Ne yield relative to control value (2) 46- 51 F6.4 --- 22Ne ^22^Ne yield relative to control value (2) 53- 60 F8.4 --- 23Na ^23^Na yield relative to control value (2) 62- 68 F7.4 --- 24Mg ^24^Mg yield relative to control value (2) 70- 75 F6.4 --- 25Mg ^25^Mg yield relative to control value (2) 77- 82 F6.4 --- 26Mg ^26^Mg yield relative to control value (2) 84- 90 F7.5 --- 26Al ^26^Al yield relative to control value (2) 92- 97 F6.4 --- 27Al ^27^Al yield relative to control value (2)
Note (1): Models considered have the parameters: M=4 Z=0.0001; M=5 Z=0.0001; M=5 Z=0.004; M=5 Z=0.008; M=5 Z=0.02; M=6 Z=0.0001; M=6 Z=0.004; M=6 Z=0.008; M=6 Z=0.02 Note (2): Ratio of result yield to control value, where positive values indicate extra production, negative values extra destruction, and zero means no change.
Acknowledgements: M. Lugaro, lugaro(at)phys.uu.nl
(End) Patricia Vannier [CDS] 15-Feb-2007
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