TITLE:

Optical Variability of Quasars

AUTHORS: 

D. Trevese, A. Bunone, D. Nanni, M. A. Bershady, R. G. Kron

PUBLISHED: to appear in "National Meeting on AGNs," (Italy),
Mem. Soc. Astron. It.

ABSTRACT:

The variability of quasars can be used both to constrain the emission
model and to identify quasar candidates. We report recent progresses
in the optical variability studies based on deep U, B(J), F photometry
in Selected Area 57, which show the wavelength dependence of quasar
variability. We also present some preliminary results on the selection
of a sample of active galaxies on the basis of their variability.