uvby{beta} photometry of early type stars

The strength of their pulsational driving strongly depends on the opacity of iron-group elements. As many of those stars naturally occur in young open clusters, whose metallicities can be determined in several fundamental ways, it is logical to study the incidence of pulsation in several young open clusters.

To provide the foundation for such an investigation, Stroemgren-Crawford uvby{beta} photometry of open cluster target stars was carried out to determine effective temperatures, luminosities, and therefore cluster memberships. In the course of three observing runs, uvby{beta} photometry for 168 target stars was acquired and transformed into the standard system by measurements of 117 standard stars. The list of target stars also included some known cluster and field {beta} Cephei stars, as well as {beta} Cephei and SPB candidates that are targets of the asteroseismic part of the Kepler satellite mission.