Speckle observations of binary systems measured by Hipparcos

From speckle observations made with tile PISCO speckle camera at tile Pic d u Midi Observatory, we present high angular resolution astrometric data for 43 binary stars already observed by the Hipparcos satellite. This sample c onsists of mainly new Hipparcos eclipsing binaries with a visual companion closer than one arcsecond, chosen with the aim to study the dynamical impli cations of a third component oil the observational parameters: of the eclip sing system. In addition, we also included a selection of close visual bina ries with few speckle data in order to analyse possible systematic departur es between the speckle and the non-speckle orbits. The reduction method and the results are presented in detail. For the close visual binaries we conf ront our observations with the ephemerides based on the best known orbits. For the wide visual binaries the confrontation is made directly with the Hi pparcos data. Our observations are consistent both with previous speckle da ta and with most of the Hipparcos measurements.