Radial Velocity Studies of Close Binary Stars. XIV
Radial velocity (RV) measurements and sine curve fits to the orbital RVvariations are presented for 10 close binary systems: TZ Boo, VW Boo, ELBoo, VZ CVn, GK Cep, RW Com, V2610 Oph, V1387 Ori, AU Ser, and FT UMa.Our spectroscopy revealed two quadruple systems, TZ Boo and V2610 Oph,while three stars showing small photometric amplitudes, EL Boo, V1387Ori, and FT UMa, were found to be triple systems. GK Cep is a closebinary with a faint third component. While most of the studied eclipsingsystems are contact binaries, VZ CVn and GK Cep are detached orsemidetached double-lined binaries, and EL Boo, V1387 Ori, and FT UMaare close binaries of uncertain binary type. The large fraction oftriple and quadruple systems found in this sample supports thehypothesis of formation of close binaries in multiple stellar systems;it also demonstrates that low photometric amplitude binaries are afertile ground for further discoveries of multiple systems.Based on the data obtained at the David Dunlap Observatory, Universityof Toronto, Canada.
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