Mesures d'étoiles doubles effectuées à la lunette de 50 cm de l'Observatoire de Nice avec une caméra CCD^*

CCD measurements of visual double stars made with the 50 cm refractor of the Nice Observatory

¹ Observatoire de la Côte d'Azur, Département Fresnel, BP. 229, 06304 Nice Cedex, France
² Route des Choseaux, 74320 Sevrier, France
³ 25 Bd. Arago, 75013 Paris, France e-mail: guy.morlet@wanadoo.fr
⁴ 161 Av. Ste Marguerite, Clos Ste Marguerite, 06210 Nice, France e-mail: r-gili@infonie.fr

Received: 16 November 1998
Accepted: 19 November 1998

Abstract

We present the measurements of 49 visual double stars made in 1997 with the 50 cm refractor of the Nice Observatory (Table 1). A CCD camera was attached to this refractor. Some new binaries discovered by Hipparcos have been measured. The algorithm used for these measurements is based on the adjustment of a tridimensional mathematical surface.