ON THE NORMAL ENERGY-DISTRIBUTION IN STELLAR SPECTRA - O5-O8 STARS

The spectral energy curves for a number of O4-O8 stars are analyzed us ing measurements taken from six sources of spectrophotometric data. Ba sed on the normal UBV color indices for O stars, these stars are divid ed into three groups (O5, O6-O7, and O8), for each of which the normal energy distribution is derived and presented. Comparison of these dis tributions indicates clear differences between the O5 and O8 subclasse s at UV wavelengths. A single normal distribution curve is, therefore, insufficient to characterize the O spectral class as a whole.