The Astronomical Journal · 1995 · 244 citations · 0 references
Natural SciencesAstronomyPhysicsAstrometryAstrophysicsObservational AstronomyAstrometric Data ReductionAstrometric InstrumentationBinary Star SystemsInterferometrySpace-based AstrometryStellar ObservationsAstrometric BinariesAstrometric Binary OrbitsBinary Star AstrometryBinary Star ObservationsDirect DetectionSpeckle InterferometryVisual BinariesVisual Binary Orbits
Xi Ursae Majoris (HR 4374/5) consists of a visual binary having a period of nearly 60 yr, the primary component of which is a 669 day astrometric and spectroscopic subsystem, and the secondary is a 4 day spectroscopic binary. We report here improved elements for the long-period visual system (AB) and the short-period astrometric system (Aa). We also report the first direct detection of a fifth component to the multiple system (Bc) from speckle observations obtained in 1988 at the Canada-France-Hawaii Telescope.