Speckle observations with PISCO in Merate - II. Astrometric measurements of visual binaries in 2004

Abstract

International audienceWe present relative astrometric measurements of visual binaries taken during the second semester of 2004 with the Pupil Interferometry Speckle camera and Coronagraph (PISCO) at the 1-m Zeiss telescope of the Brera Astronomical Observatory, in Merate, Italy. We performed 207 new observations of 194 objects with angular separations in the range 0.1-4.0 arcsec and an accuracy better than ~0.01 arcsec. Our sample contains orbital couples as well as binaries whose motion is still uncertain. Our purpose is to improve the accuracy of the orbits and constrain the masses of the components. Those measurements show that the orbit of ADS 15115 needs to be revised; we propose a new orbit for this object

Preliminary orbital elements of six visual binary stars

“…Since the installation of PISCO on the 102-cm Zeiss telescope in 2004, this raises to fourteen the total number of the published orbits, that we have computed with measurements obtained in Merate (Scardia et al 2005(Scardia et al , 2006(Scardia et al , 2007a(Scardia et al ,b, 2008.…”

Speckle observations with PISCO in Merate: VI. Astrometric measurements of visual binaries in 2006

“…6 and 7 for the separation ρ and position angle θ, respectively. The orbital elements used for computing the ephemerides were retrieved from OC6 and from our last publications (Scardia et al 2006(Scardia et al , 2008a(Scardia et al , 2008b. When extracted from OC6, the corresponding bibliographic references are indicated in Col. 3 as they appear in this catalogue, with an asterisk.…”

Speckle observations with PISCO in Merate (Italy): XIV. Astrometric measurements of visual binaries in 2013 and new orbits for ADS 1097, 5871, 7203, 7775, 9378, 9578, and 11186

“…It is the fourteenth of a series whose purpose is to contribute to the determination of binary orbits (Scardia et al 2005(Scardia et al , 2006(Scardia et al , 2007(Scardia et al , 2008aPrieur et al 2008;Scardia et al 2009;Prieur et al 2009;Scardia et al 2010;Prieur et al 2010;Scardia et al 2011;Prieur et al 2012;Scardia et al 2013;Prieur et al 2014, herein Papers I to XIII). The focal instrument PISCO was developed at Observatoire Midi-Pyrénées (France) and first used at Pic du Midi from 1993 to 1998.…”