Journal Article

Speckle observations with PISCO in Merate – V. Astrometric measurements of visual binaries in 2006

J.-L. Prieur, M. Scardia, L. Pansecchi, R. W. Argyle, M. Sala, M. Ghigo, L. Koechlin and E. Aristidi

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 387, issue 2, pages 772-782
Published in print June 2008 | ISSN: 0035-8711
Published online May 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13265.x
Speckle observations with PISCO in Merate – V. Astrometric measurements of visual binaries in 2006

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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.

Keywords: techniques: interferometric; astrometry; binaries: close; binaries: visual; stars: individual: ADS 277

Journal Article.  3804 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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