SIMBAD references

2007MNRAS.374..965S - Mon. Not. R. Astron. Soc., 374, 965-978 (2007/January-3)

Speckle observations with PISCO in Merate - III. Astrometric measurements of visual binaries in 2005 and scale calibration with a grating mask.

SCARDIA M., PRIEUR J.-L., PANSECCHI L., ARGYLE R.W., BASSO S., SALA M., GHIGO M., KOECHLIN L. and ARISTIDI E.

Abstract (from CDS):

We present relative astrometric measurements of visual binaries made during the first semester of 2005, with the Pupil Interferometry Speckle Camera and Coronagraph (PISCO) at the 102-cm Zeiss telescope of the Brera Astronomical Observatory, in Merate. We performed 214 new observations of 192 objects, with angular separations in the range 0.2-4.3arcsec, and with an average accuracy of 0.01arcsec. Most of the position angles could be determined without the usual 180° ambiguity, and their mean error is. Our sample contains orbital couples as well as binaries whose motion is still uncertain. The purpose of this long-term programme is to improve the accuracy of the orbits and constrain the masses of the components.

For the first time with PISCO, the astrometric calibration was made with a grating mask mounted at the entrance of the telescope. The advantage of this procedure is to provide a reliable and fully independent scale determination.

We have found two possible new triple systems: ADS 7871 and KUI 15. We propose a preliminary orbit for ADS 4208.


Abstract Copyright: 2006 The Authors. Journal compilation © 2006 RAS

Journal keyword(s): techniques: interferometric - astrometry - binaries: close - binaries: visual

Simbad objects: 197

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