Non-radial Modes and Modulation in Galactic Cepheids from OGLE-IV Survey

Rajeev Singh Rathour, Radosław Smolec and Henryka Netzel

This work involves a detailed search for additional low-amplitude variability phenomena such as presence of a non-radial mode or a periodic modulation, in Galactic Cepheids. We perform frequency analysis of ∼2000 Cepheids from Galactic disk and bulge sample using the OGLE-IV survey photometry. In our study, we identify 16 candidate detections for radial multi-mode pulsations, 12 first overtone (1O) Cepheids with associated non-radial mode signature, and 3 Cepheids with periodic modulation of pulsation. These findings extend their respective samples in the Galactic fields and overall provide a basis to compare their properties with samples in the Magellanic Clouds.

Proceedings of the Polish Astronomical Society, vol. 12, 202-205 (2022)

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