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We have obtained uvby − β photoelectric photometry with the 0.84 m telescope of the San Pedro Martir Observatory, México, for the stars HD220735 and HD30110 which were found to be new variable stars. For these stars we determined some of their physical characteristics, such as effective temperature and surface gravity.

We determine the nature of the Delta Scuti star AD CMi and its physical parameters from newly determined times of maximum light and other times from the literature, as well as from uvby −β photoelectric photometry.

We have obtained uvby − β photoelectric photometry with the 0.84 m telescope at the San Pedro Mártir Observatory, México, for the stars HD 115520, HD 220735 and HD 26738. The first two had been previously determined to be variables whereas the last one is being reported here as a new variable. With an extended time basis for the first two, we have determined their period of pulsation, which is found to be stable. Physical parameters are presented for the three stars.