The ultraviolet spectra of four binaries observed with the S59 spectrometer

Abstract

Ultraviolet spectra ofo And, α CrB, η Ori A and α Vir, which were obtained with the S59 spectrometer at a resolution of 1.7 A in three 100 A wide regions centered at 2110, 2454 and 2825 A, have been studied for the presence or the absence of the effects due to their binary nature. As may have been anticipated from their orbital and other characteristics, no indication of strong binary interactions were seen in these observations. However, there are certain spectral peculiarities suggesting the possibility of modifications of spectral classifications for some of these objects. A rather unusual spectral behavior in α Vir is also noted. In addition, based primarily on the reviewing of the available literature, we draw new attention to a remarkable property of the third component in η Ori A.