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Non-radial Pulsations in RR Lyrae Stars from the OGLE Collection
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RR Lyrae stars are classical pulsating stars. They pulsate mostly in the radial fundamental mode (RRab stars), in the radial first overtone mode (RRc stars), or in both modes simultaneously (RRd stars). Collection of variable stars from the Optical Gravitational Lensing Experiment (OGLE) contains more than 38 000 RR Lyrae stars from the Galactic bulge. We analysed these data for RRc and RRd stars. We have found new members of radial-non-radial double-mode RR Lyrae stars, with characteristic period ratio of the two modes around 0.61. We increased the number of known RR Lyrae stars of this type by a factor of 8. We have also discovered another group of double-mode RR Lyrae stars. They pulsate in the first overtone and in another, unidentified mode, which has period longer than period of the undetected fundamental mode. The period ratios tightly cluster around 0.686. These proceedings are focused on this puzzling group. In particular, we report eight new members of the group.
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Cited by 1 Pith paper
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The census of non-radial pulsation in first-overtone RR Lyrae stars of the OGLE Galactic bulge collection
Using the full OGLE Galactic bulge sample of first-overtone RR Lyrae stars, this study finds 960 stars with period ratios near 0.61 and 147 near 0.68, and presents statistical support for Dziembowski's l=8 and l=9 non...
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