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Abstract: Current status of the lack of understanding Blazhko effect is reviewed. Wefocus mostly on the various components of the failure of the models and touchupon the observational issues only at a degree needed for the theoreticalbackground. Attention is to be paid to models based on radial mode resonances,since they seem to be not fully explored yet, especially if we considerpossible non-standard effects e.g., heavy element enhancement. To aid furthermodeling efforts, we stress the need for accurate time-series spectral lineanalysis to reveal any possible non-radial components and thereby let toinclude or exclude non-radial modes in explaining the Blazhko phenomenon.

Autor: Geza Kovacs


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