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Spectral analysis by means of Non-LTE model-atmosphere techniques has arrivedat a high level of sophistication: fully line-blanketed model atmospheres whichconsider opacities of all elements from H to Ni allow the reliabledetermination of photospheric parameters of hot, compact stars. Such modelsprovide a crucial test of stellar evolutionary theory: recent abundancedeterminations of trace elements like, e.g., F, Ne, Mg, P, S, Ar, Fe, and Niare suited to investigate on AGB nucleosynthesis. E.g., the strong Fe depletionfound in hydrogen-deficient post-AGB stars is a clear indication of anefficient s-process on the AGB where Fe is transformed into Ni or even heaviertrans iron-group elements. We present results of recent spectral analyses basedon high-resolution UV observations of hot stars.

Non-LTE Spectral Analysis of Extremely Hot Post-AGB Stars: Constraints for Evolutionary Theory