Balmer line equivalent widths of B-F main sequence stars. Comparison with theoretical models

The equivalent widths of the Balmer lines Hsub(α) and Hsub(β) and Hsub(γ) were obtained for 175 B-F main-sequence stars. The comparison with the values calculated on the basis of modern stellar atmosphere models is represented. Mean for spectral class values of Wsub(lambda) are shown to be in a good agreement with the theoretical ones. This confirms the conclusion about the satisfactory agreement of observations and models based on the analysis of the continuum. Models give close values of equivalent widths in the range of spectral B4-A1 classes for Hsub(γ) line. Values of equivalent widths of all three lines for stars of earlier spectral classes than B4 agree better with the D. Mihalas model. For stars of F spectral class equivalent widths of Hsub(γ) lines lie a bit higher than the theoretical values