EXTREME AMPLITUDE VARIATIONS IN 28-AND

New simultaneous observations using the four uvby filters of the Strom gren photometric system have been collected in the year 1996 for the l ow amplitude delta Sct star 28 And. During the course of these observa tions, the observed amplitude of the light curves is very small as com pared with any other data set available in the literature for this sta r. In particular, the actual amplitude is about 19 times less than dur ing the last observing run, five years before. The frequency analysis of the data also reveals the existence of a secondary frequency upsilo n(2). Hence, the monoperiodicity is not confirmed with the new data. I n addition, the analysis of the phase shifts between observed light va riations confirms the nonradial nature of the main pulsation of this s tar.