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Astron. Astrophys. 346, 523-531 (1999)

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CCD photometry and astrometry for visual double and multiple stars of the HIPPARCOS catalogue *

I. Presentation of the large scale project

E. Oblak 1, P. Lampens 2, J. Cuypers 2, J.L. Halbwachs 3, E. Martín 4,5, W. Seggewiss 6, D. Sinachopoulos 2, E.L. vanDessel 2, M. Chareton 1 and D. Duval 2

1 Observatoire de Besançon, 41 bis, avenue de l'Observatoire, B.P. 1615, F-25010 Besançon Cedex, France (oblak@obs-besancon.fr)
2 Koninklijke Sterrenwacht van Belgiï, Ringlaan 3, B-1180 Brussel, Belgium (patricia.lampens@oma.be)
3 Observatoire de Strasbourg, 11, rue de l'Université, F-67000 Strasbourg, France (halbwachs@astro.u-strasbg.fr)
4 University of California at Berkeley, 601 Campbell Hall, Berkeley CA 94720, USA (ege@popsicle.berkeley.edu)
5 Instituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife, Spain
6 Observatorium Hoher List der Universitäts-Sternwarte Bonn, D-54550 Daun, Germany (seggewis@astro.uni-bonn.de)

Received 17 December 1998 / Accepted 8 April 1999


A description is given of the activities of an international working group created with the aim of obtaining both photometric and astrometric observations of visual double and multiple stars with angular separations in the range of one to fifteen arcseconds, that formed part of the HIPPARCOS Input Catalogue. The scientific aims and realisations of this European network are given. About 50 observational missions have been carried out in both hemispheres according to a pre-defined protocol. We describe the general and specifically designed methods used for the reduction of large amounts of CCD observations of double stars and give an outline of the results already presented and soon to be expected.

Key words: techniques: photometric – astrometry – stars: binaries: visual – stars: fundamental parameters

* Based on observations made at La Silla (ESO, Chile - Key Programme 7-009-49 K), Observatoire de Haute-Provence (OHP), Calar Alto (CLA), La Palma (LPL) and Jungfraujoch (JFJ) Observatories

Send offprint requests to: E. Oblak

© European Southern Observatory (ESO) 1999

Online publication: May 21, 1999