  Fifteen variable stars have been discovered during four nights of monitoring
of NGC 7789. It was possible to determine periods for ten of these variables.
Seven objects are W UMa-type binaries, in this number five are members of the
cluster. Among the remaining variables, there are three further close binaries,
one delta Scuti which is a Blue Straggler in the cluster, and one multi-modal
variable (with indeterminable periods). One of the binaries showed an
eclipse-like event; this binary is a good candidate for determination of masses
of its components at the turn-off point of the cluster.
