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

Abstract

We present relative astrometric measurements of visual binaries made in 2013 with the speckle camera PISCO at the 102-cm Zeiss telescope of Brera Astronomical Observatory, in Merate. Our observing list contains orbital couples as well as binaries whose motion is still uncertain. We obtained 134 new measurements of 129 visual binary stars, with angular separations in the range 0. 23-5 and an average accuracy of 0. 01. The mean error on the position angles is 0.• 5. 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 new revised orbits for ADS 1097, 5871, 7203, 7775, 9378, 9578, and 11186, partly derived from PISCO observations. The corresponding estimated values for the masses of those systems are compatible with the spectral types.

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): XVI. Astrometric measurements of visual binaries in 2015, and new orbits for DUN 5, ADS 5958, 6276, 7294, 8211, and 13169

“…This paper presents the results of speckle observations of visual binary stars made in Merate, Italy, in 2015 with the Pupil Interferometry Speckle camera and COronagraph (PISCO) on the 102‐cm Zeiss telescope of INAF—Osservatorio Astronomico di Brera (OAB, Brera Astronomical Observatory). It is the sixteenth of a series whose purpose is to contribute to the determination of binary orbits (Prieur et al , , , , , ; Scardia et al , , , , , , , , , herein: Papers I–XV). The focal instrument PISCO was developed at Observatoire Midi‐Pyrénées (France) and first used at Pic du Midi from 1993 to 1998.…”

Speckle observations with PISCO in Merate (Italy): XV

“…This paper presents the results of speckle observations of visual binary stars made in Merate (Italy) in 2014 with the Pupil Interferometry Speckle camera and COronagraph (PISCO) on the 102‐cm Zeiss telescope of INAF – Osservatorio Astronomico di Brera (OAB, Brera Astronomical Observatory). It is the 15th of a series whose purpose is to contribute to the determination of binary orbits; the papers I to XIV are Scardia et al (2005, 2006, 2007, 2008a), Prieur 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), and Scardia et al (2015a), respectively.…”