CCD measurements of visual double stars made with the 50 cm refractor of the Nice Observatory (2^nd series)^*

¹ Observatoire de la Côte d'Azur, Département Fresnel, BP. 229, 06304 Nice Cedex, France
² 25 Bd. Arago, 75013 Paris, France e-mail: gmorlet@cybercable.fr
³ 284 route des Choseaux, 74320 Sevrier, France e-mail: maurice.salaman@wanadoo.fr
⁴ 161 Av. S$^{\rm te}$ Marguerite, Clos S$^{\rm te}$ Marguerite, 06210 Nice, France e-mail: r-gili@infonie.fr

Received: 23 February 2000
Accepted: 19 April 2000

Abstract

We present the measurements of 65 visual double stars made in 1998 with the 50 cm refractor of the Nice Observatory (Table 1). A CCD camera was attached to this refractor. 6 new binaries discovered by Hipparcos have been measured. The algorithm used for these measurements is based on the adjustment of a tridimensional mathematical surface.