PHOTOMETRY OF OPEN CLUSTERS .3. HR-4684 AND HD-106103 IN COMA BERENICES

Differential photoelectric photometry of the Delta Scuti stars HR 4684 and HD 106103 is presented. Membership of these stars to the cluster is established through a compilation from the literature of uvby-beta photometry of 69 stars in the direction of Coma Berenices. Reddening a nd distance are determined to be of E(b-y) = 0.002 and 81.75 pc, respe ctively. An age for the cluster of 5 X 10(8) yr is derived by comparis on with theoretical isochrones. Values of log T(eff) and log g are det ermined for each member star to the cluster. No significant physical d ifference is found between the variable stars and others with the same physical characteristics. Determination of several Ap stars is establ ished.