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A study on the evolutionary period changes of short-period type II cepheids

Pastukhova, Elena N.; Yacob, Alemiye Mamo; Berdinkov, Leonid N.

We investigate the period changes of 13 short-period Type II Cepheids using the O-C method over a century-long data baseline. The O-C diagrams for these stars exhibit a parabolic trend, indicating both increasing and decreasing period changes over time. These observed period changes are consistent with recent theoretical models based on horizontal…