Abstract
We present the results of a photometric multi-colour, two-site observing campaign of β Cephei stars in the young open cluster NGC 4755. More than 260 h of time-series U, B, V filter data of the cluster were acquired on two continents during 1999 and 2000. We list the detected pulsation frequencies and discuss the results of their analysis. Mode identification of the detected modes is performed as well. In addition, we present the detection of four new variable stars in NGC 4755. We give frequency solutions as indicators of the time-scales and amplitudes of the pulsations. NGC 4755-116 is probably a B2 dwarf with a period of 4.2 d whose variability is caused by a spot or g-mode pulsation. NGC 4755-405 can be considered as a new β Cephei star with two pulsation frequencies. For NGC 4755-215 we found one frequency and for NGC 4755-316 three pulsation frequencies; we suggest that both are new slowly pulsating B stars of short period.
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