CCD astrometry and components instrumental magnitude difference of 432 Hipparcos wide visual double stars

D. Sinachopoulos , P. Gavras , O. Dionatos , C. Ducourant (1, 2, 3, 4) , Th. Medupe

1 L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux
2 OASU - Observatoire aquitain des sciences de l'univers
3 LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
4 IAG - Instituto de Astronomia, Geofísica e Ciências Atmosféricas [São Paulo]

Context: We measured the angular separations, position angles, ? V, ? y and ? I of wide visual double stars during the period 2003-2005. At least one component of the double stars in our sample has an entry in the Hipparcos catalogue. Aims: Our measurements are a contribution to the study of the nature of these double stars. Methods: The northern double stars of the project were observed with the 1.2 m telescope of the Kryonerion observatory and the southern with the 1.0 m SAAO. We performed multiple-exposure CCD imaging of our targets and used the standard procedure of data reduction and astrometric CCD calibrations. Results: We present measurements of 213 northern and 219 southern wide binaries. Based on observations made at Kryonerion Observatory of the National Observatory of Athens, Greece, and the South African Astronomical Observatory. Full Table 1 and Tables 2, 3 are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/472/1055

Mots clés: stars: binaries: visual; astrometry

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

D. Sinachopoulos, P. Gavras, O. Dionatos, C. Ducourant, Th. Medupe. CCD astrometry and components instrumental magnitude difference of 432 Hipparcos wide visual double stars. Astronomy and Astrophysics - A&A, 2007, 472 (3), pp.1055-1057. ⟨10.1051/0004-6361:20066290⟩. ⟨hal-00261843⟩