Ja. Docobo et C. Prieto, MICROMETER MEASUREMENTS OF VISUAL DOUBLE STARS MADE AT THE SPANISH OBSERVATORIES AT CALAR-ALTO AND FABRA, Astronomy & Astrophysics. Supplement series, 100(3), 1993, pp. 641-646
We present 184 micrometer measurements of 100 double stars observed wi
th 152 cm telescope at Calar Alto (Almeria, Spain) and the 38 cm refra
ctor at Fabra Observatory (Barcelona, Spain).