Abstract
The photoelectric temperatures of 52 P Cygni stars of spectral type from A4 to O5 have been determined from emission lines by Zanstra's method. For approximately half the stars, accurate spectrophotometric measures of emission line intensities were available and for the remainder the intensities were estimated on the basis of published descriptions of spectra. The computed temperatures were found to range from 10,000° to 42,000° K. and after smoothing by graphical methods a temperature scale for the O, B, and A type stars showed the following values: A0, 16,000°; B0, 35,000°; O5, 40,000° K. Comparisons are made with temperatures derived by other methods and reasons are given for attributing greater weight to the values from B0 to O5 than to those in the lower range of the sequence.
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