  We devised a straightforward procedure to derive the atmosphere fundamental
parameters of stars across the different MK spectral types by comparing
mid-resolution spectroscopic observations with theoretical grids of synthetic
spectra.The results of a preliminary experiment, by matching the Gunn and
Stryker and Jacoby et al. spectrophotometric atlases with the Kurucz models,
are briefly discussed. For stars in the A-K spectral range, effective
temperature is obtained within a 1-2% relative uncertainty (at 2 sigma
confidence level). This value raises to 4-5% for the hottest stars in the
samples (O-B spectral types). A poorer fit is obtained throughout for stars
cooler than 4000 K mainly due to the limiting input physics in the Kurucz
models.
