ARE THE s-CEPHEIDS CROSSING THE INSTABILITY STRIP FOR THE FIRST TIME?
Andriievskyi, Serhii M.
Harbuzov H. O.
Doikov, D. N.
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Using the literature data on secular period changes reported for the small-amplitude Cepheids (s-Cepheids) it is shown that these stars are not crossing the instability strip for the first time. After correction of the observed pulsational chracteristics of s-Cepheids, in the diagram ”log(dP/P)100 - log P” they become indistinguishable from usual classic Cepheids, which are supposed to have already crossed the instability strip more than (or at least) once.