CCD astrometry of visual binaries. II. Differential measurements of northern double stars.
Bibcode: 1990A&AS...83..245S
Sinachopoulos, D.; Seggewiss, W.
Belgium, Germany
Abstract
Separations and position angles of 148 visual multiple systems were measured by means of a CCD detector attached to the Calar Alto 1.23-m telescope. The program stars are candidates for the Hipparcos Input Catalog.
1990
•
Astronomy and Astrophysics Supplement Series
Hipparcos
13