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-radial mode explanation of the 0.61 group.
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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-radial mode explanation of the 0.61 group.