6 Final comments

This paper investigated the photometrically variability of four mCP stars studied by Winzer (1974). In most of the observed bandpasses, three of them are low amplitude variables and hence difficult objects to study. According to theory, the rotation of mCP stars is slowed by magnetic braking. Thus it is necessary to study mCP stars with the full range of observed amplitudes to determine the class period distribution. The moderate variable 49 Her is a candidate the further study even though we are observing it close to pole-on. Babcock (1958) notes it is a spectrum variable, but its lines are too broad for effective measurements of the Zeeman effect via photography.

Acknowledgements

This work was supported in part by NSF grants AST-9115114 and 9528506. We appreciate the continuing efforts of L.J. Boyd, R.J. Dukes, Jr., and G.P. McCook to keep the FCAPT operating properly and also the useful comments of the referee Nancy Morrison.