An Analysis of the Peculiar a Star HD 204411

Well-widened, high-dispersion spectra were used to obtain the identifications and equivalent widths for over 1500 lines between 3700 and 4900 A for the relatively cool Ap star, HD 204411 A model-atmos- phere analysis of these data was performed The large number of lines used in this study allowed us to discuss and rule out any significant departures from LTE in the level populations for the lines, or any large variation of the turbulent-velocity parameter with height. The results suggest a broadening of the Fe peak, an overall enhancement of the Fe peak relative to H, and a decrease in the ratio of light-element abundances to iron. The evidence also indicates that the s-process elements Sr and Zr have normal abun- dances relative to Fe. I. INTRODUCTIO