The chemical composition of late-type supergiants. I - Metal abundances for 14 G and K Ib stars

Effective temperatures, surface gravities, and metal abundances (Z above 10) are determined for a group of 14 G and K Ib supergiants. Overall metal abundances are found to be enhanced by 0.3 dex relative to solar values. The primary uncertainty is possible systematic effective-temperature errors caused by incorrect model temperature distributions. No evidence of s-processing is found, and no correlation between C-12/C-13 ratio and any abundance is evident.