1 Introduction

Almost 40% of the observations presented here were made with the 152 cm. Spanish telescope at E.O.C.A., Calar Alto Observatory (Almería, Spain) during an observation run at the end of July 1995. The procedure was the same as for the earlier runs performed with this telescope and using the same micrometer, see Couteau et al. (1989) and Docobo & Prieto (1993).

Together with these data, micrometer measurements made with the 35 cm reflector at Ramón María Aller Observatory (Santiago de Compostela, Spain) are included. In this latter case, the observations were carried out in 1994 and 1995 and to a lesser extent in 1996 and 1997.

Although the micrometers used at the two Observatories were different (both were made at Nice Observatory, France), the eyepieces were the same: 12, 10 and 8 mm (x1017, x1220, x1525 at Calar Alto and x325, x390, x488 at Santiago de Compostela, respectively).

With respect to the small micrometer in the 35 cm telescope, its angular equivalent of the screw pitch was 23$.\!\!^{\prime\prime}$35, i.e., 0$.\!\!^{\prime\prime}$467 per division. Using this telescope in good seeing conditions, a bright double star close to 0$.\!\!^{\prime\prime}$5 can be separated.