Observational Programme for Classical and CCD Photometry of Visual Double and Multiple Systems

E. Oblak, P. Lampens
1992 International Astronomical Union Colloquium  
Complementary accurate photometric data with astrophysical content are needed for a well-chosen sample of binaries and multiple systems for which good-quality astrometric data already exist or will soon be available. The observational programme, started in the context of the European Network of Laboratories "Visual Double Stars" (Oblaket al.1992), is therefore based on samples extracted from the "Catalogue des Composantes d'Etoiles Doubles et Multiples" (CCDM, Dommanget, 1989) and reported in
more » ... ) and reported in Annex 1 (Double and Multiple Systems) of the HIPPARCOS Input Catalogue (C. Turonet al.1992).Systems with components in the HIPPARCOS Input Catalogue are selected for which the present photometric information is poor, i.e. not all components have been observed or they have colour indices and/or magnitudes of insufficient quality for extraction of astrophysical quantities (Figure 1).Observations, performed in various observatories located in both hemispheres, must yield both classical and CCD photometric campaigns.
doi:10.1017/s0252921100006734 fatcat:sb6w6qyzgzbr3hvg2bslg6eno4