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000001856 005__ 20160701171654.0
000001856 037__ $$aASTROimport-13
000001856 100__ $$aOblak, E.
000001856 245__ $$aCCD photometry and astrometry for visual double and multiple stars of the HIPPARCOS catalogue. I. Presentation of the large scale project
000001856 260__ $$c1999
000001856 520__ $$aA description is given of the activities of an international working group created with the aim of obtaining both photometric and astrometric observations of visual double and multiple stars with angular separations in the range of one to fifteen arcseconds, that formed part of the HIPPARCOS Input Catalogue. The scientific aims and realisations of this European network are given. About 50 observational missions have been carried out in both hemispheres according to a pre-defined protocol. We describe the general and specifically designed methods used for the reduction of large amounts of CCD observations of double stars and give an outline of the results already presented and soon to be expected. Based on observations made at La Silla (ESO, Chile - Key Programme 7-009-49 K), Observatoire de Haute-Provence (OHP), Calar Alto (CLA), La Palma (LPL) and Jungfraujoch (JFJ) Observatories} 
000001856 700__ $$a Lampens, P.
000001856 700__ $$a Cuypers, J.
000001856 700__ $$a Halbwachs, J. L.
000001856 700__ $$a Martín, E.
000001856 700__ $$a Seggewiss, W.
000001856 700__ $$a Sinachopoulos, D.
000001856 700__ $$a van Dessel, E. L.
000001856 700__ $$a Chareton, M.
000001856 700__ $$a Duval, D.
000001856 773__ $$c523-531$$pAstronomy and Astrophysics$$v346$$y1999
000001856 85642 $$ahttp://esoads.eso.org/abs/1999A%26A...346..523O
000001856 905__ $$apublished in
000001856 980__ $$aREFERD