The question of stellar stability is extremely important. To do further reduce the limits on variability requires more precise and accurate photometry with a large number of observations comparable with this paper's. An observer using CCDs to search for variables and their periods among cluster stars might be able to provide such data.
Acknowledgements
This work was supported in part by NSF grant AST-9115114 to The Citadel and in part by grants from
The Citadel Development Foundation. I appreciate the continuing efforts of Louis J. Boyd and Robert J. Dukes, Jr., to keep the FCAPT operating properly as well as the useful comments of the referee Dr. E.H. Olsen.