Low-Amplitude Periodicities in the First Overtone Classical Cepheids

Low-Amplitude Periodicities in the First Overtone Classical Cepheids

Oliwia Ziółkowska, Magdalena Styczeń, Radosław Smolec

We present preliminary results of the analysis of OGLE photometry of first overtone classical Cepheids in the Magellanic Clouds. We searched for additional, low-amplitude periodicities beyond radial modes. In particular, our search focused on non-radial modes with period ratios, Px/P1O , in the 0.60-0.65 range, and on additional periodicities with frequencies close to the radial mode frequency. Statistical analysis of the detected signals is presented and differences between Cepheids in the Large and Small Magellanic Clouds (LMC and SMC) are discussed.

Proceedings of the Polish Astronomical Society, vol. 10, 75-77 (2020)

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Low-Amplitude Periodicities in the First Overtone Classical Cepheids