the Annual Meeting of the AAVSO, October 25, 1997
are preliminary results of a pilot project to monitor changes in the
ephemerides of northern hemisphere Cepheid's using an SBIG camera attached to
the 0.4-m telescope of the campus obversatory at Saint Mary's University.
Epochs of maximum light for fifteen Cepheid's have been derived using published
light curves for each variable as templates, and the results are being used to
update the O-C ephemerides for the program stars. Results for BB Her are
presented here. Period changes for Cepheid variables are demonstrated to be an
excellent means of pinpointing their evolutionary status, as well as for
investigating other peculiarities of the class.