Spectral types, luminosity classes, and photoelectric UBV magnitudes are presented for the components of 91 visual double-star systems. The spectrograms used for classification were obtained with a reciprocal dispersion of 128 A/mm, and the UBV observations were made at projected diaphragm sizes of 15, 20, and 33 arcsec. The problem of scattered light arising during photoelectric observations of visual binaries is discussed.
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Lutz et al. (1977) studied this question.