Relative astrometric and photometric measurements of visual binaries made with the Nice 76-cm refractor in 2008
Résumé
We present relative astrometric and photometric measurements of visual binaries made in 2008, with the 76-cm refractor of Côte d'Azur Observatory. Our observing list contains orbital couples as well as binaries whose motion is still uncertain. Three different techniques were used for obtaining measurements: Lucky imaging, speckle interferometry and the Direct Vector Autocorrelation method. We obtained 2420 new measurements of the relative position of 2225 objects, with angular separations in the range 0.07 arcsec-11.5 arcsec, and an average accuracy of 0.02 arcsec. The mean error on the position angles is 0.6 deg. We managed to observe faint systems (m_V ≈ 12) with large magnitude difference (up to Δ m_V ≈ 5). We have thus been able to measure many systems containing red dwarf stars that had been poorly monitored since their discovery. We also measured the difference of magnitude of the two components of 376 objects with an estimated error of 0.1 mag. Finally, we provide a list of 33 newly discovered components of multiple or binary systems, which is a significant complement to our GII catalog. } %% end abstract
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