ATOMIC DATA FOR OPACITY CALCULATIONS .22. COMPUTATIONS FOR 2472790 MULTIPLET GF-VALUES IN FE-VIII TO FE-XIII

In the calculation of opacities for stellar interiors it is found that very large numbers of spectrum lines of iron ions make important cont ributions. In the work of the Opacity Project me main computations of atomic data have been made using R-matrix methods, referred to as RMAT . For the important ionization stages of Fe VIII to Fe XIII further at omic data are required. For those stages calculations have been made u sing the code SUPERSTRUCTURE for a further 2472790 spectral multiplets in Ls coupling. These are referred to as PLUS data. Results are compa red for cases in which both RMAT and PLUS calculations have been made. For many individual transitions the differences can be quite large, w hich is a consequence of the larger amount of configuration-interactio n included in the RMAT work. For statistical purposes, such as the cal culation of Rosseland-mean opacities, the accuracy of the PLUS data sh ould be adequate.