3C 345: The Historical Light Curve (1966-1991) from the digitized plates of the Asiago Observatory

Abstract

In the frame of a large project to digitize the plate archives of the Italian and Vatican Astronomical Observatory, we have already performed the digitization of all available plates of the field of 3C345. The plates, approximately 100, were taken with the three telescopes of the Asiago Observatory (122 cm, 180 cm, 67/90 Schmidt Telescope) in the period from 1966 to 1991. Many of them were not analyzed till now, so we present here essentially new data about the variability of 3C 345 and also of other six quasars in the same field, in that period.