Period Doubling and Modulation of Pulsation in Type II Cepheids from the OGLE Collection

Radosław Smolec, Paweł Moskalik, Emese Plachy, Igor Soszyński and the OGLE Team

We report the initial results of the analysis of type II Cepheids' photometry collected by the OGLE project. New cases of period doubling in BL Her and W Vir-type variables are reported. Examples of a quasi-periodic modulation of the pulsation in BL Her variables, akin to the well-known Blazhko effect, are reported for the first time.

Proceedings of the Polish Astronomical Society, vol. 6, 321-322 (2018)

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