A Search for Evolutionary Changes in the Periods of Five Classical Cepheid Stars: R Cru, T Cru, XZ Car, X Lac and WZ Car

Abstract

In the present paper, we used the O-C diagrams for five classical Cepheid stars in our galactic plane to drive the rate of its period changes. The rate of period changes for individual Cepheid variables is being used to examine the parameters of stars as they crossing the instability strip (Effective temperature, Amplitude, Radius). So far, the studies have been very successful in mapping the pulsation amplitude of Cepheids across the instability strip. We found significant results and strong indications of the evolutionary period change in some Classical Cepheids understudy are not the results of the random cycle-to-cycle.