HR-1328 - A COOL EDGE SLOWLY-PULSATING B-STAR

We report on the discovery of a photometric variability (in Stromgren u and v filters) of HR 1328, a B8 main-sequence star. Two periods are easily derived, of the order of 0.61 d and 0.77 d. From the position o f this star in the HR diagram together with other pulsational characte ristics, HR 1328 can be classified as a Slowly Pulsating B star (SPB). Although these stars are found to oscillate in high-order g-modes the relatively short pulsation periods of HR 1328 point towards lower-ord er g-modes in this case. Together with HD 123515, HR 1328 extends and precises the observational cool edge of the SPB's instability strip.