Abstract
We present CCD uvbyβ data for stars in the young open cluster NGC 4755. We use these data to refine the distance modulus of the cluster. We also present results of an intensive survey for short-period variables using photoelectric and CCD photometry. We confirm three previously known β Cep variables and find six new stars of this type. All nine β Cep stars are located in a small region of the colour-magnitude diagram. Unlike NGC3293, a few constant stars are found within the β Cep instability strip in NGC 4755, which is displaced to somewhat lower temperatures relative to the former cluster. As in NGC 3293, we do not find any evidence for a population of high-order g-mode pulsators (53 Per stars) predicted by models using the OPAL opacities
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