Spectral classification and UBV photometry of bright visual double stars

Astronomy and Astrophysics – Astronomy

Scientific paper

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Binary Stars, Stellar Luminosity, Stellar Spectrophotometry, Ubv Spectra, Astronomical Catalogs, B Stars, Classifications, O Stars, Stellar Magnitude

Scientific paper

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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