Speckle observations with PISCO in Merate – V. Astrometric measurements of visual binaries in 2006 |
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| Authors: | J-L Prieur M Scardia L Pansecchi R W Argyle M Sala M Ghigo L Koechlin E Aristidi |
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| Institution: | Laboratoire d'Astrophysique de Toulouse-Tarbes, Universitéde Toulouse –CNRS, 14 Avenue Edouard Belin, 31400 Toulouse, France;INAF –Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate, Italy;Institute of Astronomy, Madingley Road, Cambridge CB3 0HA;UMR 6525 d'Astrophysique, Universitéde Nice Sophia –Antipolis –CNRS, Parc Valrose, 06108 Nice Cedex 2, France |
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| Abstract: | We present relative astrometric measurements of visual binaries made during the first semester of 2006, with the Pupil Interferometry Speckle camera and COronagraph at the 102-cm Zeiss telescope of the Brera Astronomical Observatory, in Merate. Our sample contains orbital couples as well as binaries whose motion is still uncertain. We obtained 217 new measurements of 194 objects, with angular separations in the range 0.1–4.2 arcsec, and an average accuracy of 0.01 arcsec. The mean error on the position angles is 0 5. About half of those angles could be determined without the usual 180° ambiguity by the application of triple-correlation techniques. We also present a revised orbit for ADS 277 for which the previously published orbit resulted in a large residual from our measurements. |
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| Keywords: | techniques: interferometric astrometry binaries: close binaries: visual stars: individual: ADS 277 |
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