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As a result of the variability survey in  χ  Persei and NGC 6910, the number of  β  Cep stars that are members of these two open clusters is increased to twenty stars, nine in NGC 6910 and eleven in  χ  Persei. We compare pulsational properties, in particular the frequency spectra, of  β  Cep stars in both clusters and explain the differences in terms of the global parameters of the clusters. We also indicate that the more complicated pattern of the variability among B‐type stars in  χ  Persei is very likely caused by higher rotational velocities of stars in this cluster. We conclude that the sample of pulsating stars in the two open clusters constitutes a very good starting point for the ensemble asteroseismology of  β  Cep‐type stars and maybe also for other B‐type pulsators (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Towards ensemble asteroseismology of the young open clusters χ Persei and NGC 6910