Search Publications

Search for Evolutionary Changes in the Periods of the Cepheids CEa Cas and CEb Cas

Berdnikov, L. N.; Pastukhova, E. N.; Ikonnikova, N. P. +4 more

For two classical Cepheids, CEa Cas and CEb Cas, members of the open cluster NGC 7790, we have constructed $O-C$ diagrams spanning a time interval of 125 years. The $O-C$ diagrams have the shape of parabolas, which has allowed us for the first time to determine the quadratic light elements and to calculate the rates of evolutionary changes in thei…