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Some Applications of Model Atmospheres

In the five years since the last invited paper on model stellar atmosphere applications there have been many significant advances made on all fronts. The five aspects which I will cover in this paper are: (1) the results of white dwarf model atmosphere investigations; (2) the results of the inclusion of non LTE phenomena in the atmosphere computations of hot (T > 15,000 K) stars; (3) the probable understanding of the cause of peculiar abundance patterns in the Ap and Bp and Am stars; (4) the advances in theory and observations of cool star atmospheres; and (5) the use of synthetic spectra and colours.