HR 5637 : the unveiling of a binary.
Cottrell, P. L.; Ake, T. B., III; Noordanus, B.
South Africa, New Zealand, United States
Abstract
HR 5637, previously classified as G1/3 Ib/II but considered composite by Bidelman and MacConnell, has been examined both photometrically and spectroscopically. The spectroscopic observations spanned the wavelength interval 1000-7000 A. Using these data in various combinations, the star is shown to be a binary with components of G2-5Ib and B8 V, with a magnitude difference Delta V of about 2.5 + or - 0.3 mag. This conclusion follows principally from the combination of low-resolution optical spectra of the components. These results are confirmed by ultraviolet (IUE) observations.