PHOTOELECTRIC UBVRI SEQUENCES IN THE MAGELLANIC CLOUD CLUSTERS NGC-152, NGC-1978, AND NGC-2121

We present UBVRI photoelectric sequences for the Small Magellanic Clou d blue cluster NGC 152 and the Large Magellanic Cloud red clusters NGC 1978 and NGC 2121. All of them fall in fields suitable for CCD covera ge. The number of stars and the range of magnitude and colors are: NGC 152, eight stars with 12.7<V<16.1; 0.6<B-V<1.6; NGC 1978, ten stars w ith 13.1<V<15.3; -0.2<B-V<1.7; NGC 2121, nine stars with 12.7<V<15.5; 0.5<B-V<1.2. The stars were measured an average of five times on at le ast three different nights. Six stars are in common with previous work s in NGC 152, and two each in NGC 1978 and NGC 2121.