Speckle observations with PISCO in Merate: XI. Astrometric measurements of visual binaries in 2010

Abstract

We present relative astrometric measurements of visual binaries made in 2010 with the Pupil Interferometry Speckle camera and COronagraph (PISCO) on the 102 cm Zeiss telescope of the Brera Astronomical Observatory, in Merate. Our observing list contains orbital couples as well as binaries whose motion is still uncertain. We obtained new 207 measurements of 191 objects, with angular separations in the range 0.2–4.7 arcsec and an average accuracy of 0.01 arcsec. The mean error on the position angles is 06. Most of the position angles were determined without the usual 180° ambiguity with the application of triple‐correlation techniques and/or by inspection of the long integration files. We also present revised orbits for ADS 5469, 8128, 8239 and 10345, and new orbits for ADS 10850 and 11170, partly derived from those observations, and infer estimated values for the masses of those systems that are compatible with the spectral types.

Binary star astrometry with milli and sub-milli arcsecond precision

“…Recent data on these studies and references to previous works can be found in Prieur et al (2012) and Scardia et al (2013). Speckle interferometry at 4-m class telescopes is an almost unique source of modern binary star measurements with high precision, the contribution from adaptive optics or long baseline interferometry being less in number (Hartkopf et al 2012).…”

Speckle observations with PISCO in Calern (France): I. Astrometric measurements of visual binaries in 2015–2016

“…The purpose of this article is to contribute to a better knowledge of the apparent relative motion of long‐period binaries so that very accurate orbits could be determined in the future and fundamental parameters such as stellar masses could be inferred from them. This article opens up a new series that will be the counterpart of the series of articles that have reported the results of observations with PISCO in Brera Astronomical Observatory (Merate, Italy): Scardia et al , , , , Prieur et al , Scardia et al , Prieur et al , Scardia et al , Prieur et al , Scardia et al , Prieur et al , Scardia et al , Prieur et al , Scardia et al , Prieur et al , and Scardia et al , herein: Papers I to XVI. The focal instrument PISCO (Prieur et al ) was developed at Observatoire Midi‐Pyrénées (France) and first used at Pic du Midi observatory (France) from 1993 to 1998.…”

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.…”