Astron. Astrophys. Suppl. Ser. 145, 67-69

CCD measurements of visual double stars made with the 50 cm refractor of the Nice Observatory (2$^{\rm nd}$ series)

G. Morlet ^1,2 - M. Salaman ^1,3 - R. Gili ^1,4

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 February 23; accepted April 19, 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.

Key words: astrometry -- binaries: visual