Talk abstract details

We present the results of an extensive multisite campaign conducted for
the two young open clusters NGC 884 and NGC 6910 by an international team consisting of 61 observers who operated 15 different instruments attached to 13 telescopes. The campaign covers three seasons, 2005-2007. More than 70,000 CCD frames were collected for each of the clusters, as well as absolute photometry and some high-resolution spectroscopy. Besides the few pulsators which were already known in the clusters prior to our campaign, we report the discovery of hundreds
of new variable stars. In particular, we found tens of multiperiodic pulsating B stars in each of the clusters. We present the oscillation frequencies of the pulsators and identify the modes from the amplitude ratio method. We highlight the importance of these two unique datasets covering stars of the same age and metallicity, for seismic tuning of stellar structure and evolution models of massive stars.