Rapid oscillations of five stars in the spectral range A and F. I

The five stars HD 4849, HD 24712, HD 182475, HD 184552 and HD 215874 are a small group of objects enclosed in a larger observational programme for searching of rapid oscillations. They have been observed with the 50 cm ESO‐telescope at La Silla (Chile). These objects are characterized as a suspected δ Scuti‐type star, an Ap star, an A9 V star, an A1m star and an A9 III‐IV star, respectively. For the first two stars the periods, dedected by other authors, were confirmed. For HD 182475 a period of 112.3 min has been estimated. In the case of HD 184552 an oscillation with a period of 163.3 min has been found. The star HD 215874 shows unambiguously a variation with a period of 97.2 min.