Abstract
On the basis of a frequency analysis of light variations of AR Her a double-mode pulsation is proposed as an explanation of the Blazhko effect. The analysis revealed a number of components, which can all be interpreted as a result of nonlinear superposition of the fundamental mode, and a mode with period P = 1/(2/P0 + 1/PB) ≃ PB/2, where P0 = 0\(\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\cdot}$}}{d}\)470 and PB = 31\(\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle\cdot}$}}{d}\)55 denote the fundamental and the Blazhko effect periods, respectively.
The P ≃ P0/2 mode can be identified as the second or the third radial overtone. In both these cases the “beat” masses derived from a comparison of the calculated (nonadiabatic) and observed period ratios for RR Lyrae variables with Blazhko effect are different from their evolutionary masses.
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Borkowski, K.J. Blazhko effect in the RR Lyrae variables as a result of double mode pulsation. Space Sci Rev 27, 511–517 (1980). https://doi.org/10.1007/BF00168344
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DOI: https://doi.org/10.1007/BF00168344