The effect of the 19F(α, p)22Ne reaction rate uncertainty on the yield of fluorine from Wolf-Rayet stars

In the light of recent recalculations of the F-19(alpha, p)Ne-22 reaction rate, we present results of the expected yield of F-19 from Wolf-Rayet (WR) stars. In addition to using the recommended rate, we have computed models using the upper and lower limits for the rate, and hence we constrain the uncertainty in the yield with respect to this reaction. We find a yield of 3.1 x 10(-4) M-circle dot of F-19 with our recommended rate, and a difference of a factor of 2 between the yields computed with the upper and lower limits. In comparison with previous work we find a difference in the yield of a factor of approximately 4, connected with a different choice of mass loss. Model uncertainties must be carefully evaluated in order to obtain a reliable estimate of the yield, together with its uncertainties, of fluorine from WR stars.