Four southern A-type supergiants

Measures of line intensities from high-dispersion spectrograms of HD 92207, 100262, 125835 and 161912 are presented. Analysis with a theoretical curve of growth leads to the selection of parameters for excitation temperature and microturbulence. The turbulent velocity in the atmosphere of HD 92207 varies through a factor of two in approximately one month, in phase with a similar change in the equivalent width of H. The spectra of the other three stars do not appear to vary, but the turbulent velocity is much less for Fei than for Feii and Crii.