Binary incidence among the BY Draconis variables

Abstract

view Abstract Citations (174) References (44) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Binary incidence among the BY Draconis variables. Bopp, B. W. ; Fekel, F., Jr. Abstract Using new radial velocity data from coud spectrograms, we critically examine the incidence of spectroscopic binaries among the BY Draconis variables. Of 13 such stars with sufficient velocity data, eight are double-line spectroscopic binaries, one is a single-line binary, and four show no apparent velocity variation. With suitable con- straints imposed by the geometrical model for the origin of the BY Dra-type photomet- ric variations, we conclude that these latter four stars are truly single, and not in low-inclination orbits. It appears that a close companion is a sufficient, but not a necessary, condition for the occurrence of the BY Dra phenomenon. Instead, relatively rapid rotation [v(equatorial) >5 km ] is viewed as the ultimate cause of the BY Dra syndrome. Publication: The Astronomical Journal Pub Date: July 1977 DOI: 10.1086/112079 Bibcode: 1977AJ.....82..490B Keywords: Binary Stars; M Stars; Radial Velocity; Stellar Spectrophotometry; Variable Stars; Spectrograms; Stellar Rotation; Ubv Spectra; Astrophysics full text sources ADS | data products SIMBAD (19)