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28 March 2024 |
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The impact of the 18F(a,p)21Ne reaction on fluorine production in AGB stars | Amanda I. Karakas
; Hye Young Lee
; Maria Lugaro
; J. Goerres
; Michael Wiescher
; | Date: |
11 Dec 2008 | Abstract: | The recent experimental evaluation of the 18F(a,p)21Ne reaction rate, when
considering its associated uncertainties, presented significant differences
compared to the theoretical Hauser-Feshbach rate. This was most apparent at the
low temperatures relevant for He-shell burning in asymptotic giant branch (AGB)
stars. Investigations into the effect on AGB nucleosynthesis revealed that the
upper limit resulted in an enhanced production of 19F and 21Ne in carbon-rich
AGB models, but the recommended and lower limits presented no differences from
using the theoretical rate. This was the case for models spanning a range in
metallicity from solar to [Fe/H] ~ -2.3. The results of this study are relevant
for observations of F and C-enriched AGB stars in the Galaxy, and to the Ne
composition of mainstream silicon carbide grains, that supposedly formed in the
outflows of cool, carbon-rich giant stars. We discuss the mechanism that
produces the extra F and summarize our main findings. | Source: | arXiv, 0812.2060 | Services: | Forum | Review | PDF | Favorites |
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