CALCULATION OF INTENSITY RATIOS OF OBSERVED INFRARED [Fe II] LINES

Two recent observational studies of the [Fe II] λ12567/λ16435 line ratio by Smith and Hartigan and Rodriguez-Ardila et al. have suggested that the available theoretical A-values could be incorrect to 10%-40%. We have carried out an extensive configuration interaction calculation of [Fe II] lines to investigate this claim, as well as the variability in observed line ratios for λ8617/λ9052 and λ8892/λ9227 of Dennefeld. For these transitions, we are generally in good agreement with the results of Nussbaumer and Storey, less so with those of Quinet et al. In comparison, the ratios derived from observations appear either to be less secure, or other factors influence those results.