Abstract
Abstract Moments of maximum brightness were determined using Hertzsprung's method for 39 stars attributed in the GCVS–IV (Kholopov et al., 1985–1987) to small-amplitude DCEPS Cepheids. An analysis of O—C diagrams enabled us to conclude that the periods of SZ Cas, V Oph, EU Tau and α UMi (and possibly of SU Cas, V1726 Cyg, V473 Lyr and UV Mon) show evolutionary changes.
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