The Spectra and Axial Rotational Velocities of the Components of 116 Visual Double-Star Systems.

Abstract

Spectral types, luminosity classes, and axial rotational velocities were estimated for the components of 116 physical visual double-star systems. H-R diagrams for the systems with normal components are compatible with current theories of stellar evolution No significant differences between the mean rotational velocities for double-star components and single stars were found, either for main-sequence or for giant stars Absolute magnitudes for normal B-type components of double stars appear to be somewhat higher than determined in earlier calibrations. Absolute magnitudes for 9 metallic-line stars and 9 peculiar A-type stars are consistent with earlier determinations. Absolute magnitudes were derived for a number of additional peculiar stars of interest