The Blazhko Effect

TL;DR

This paper reviews the current understanding and challenges of explaining the Blazhko effect in RR Lyrae stars, emphasizing the need for detailed spectral analysis to explore non-radial modes and improve theoretical models.

Contribution

It highlights the limitations of existing models, especially radial mode resonance theories, and advocates for precise spectral line analysis to advance understanding of the Blazhko effect.

Findings

Radial mode resonance models are not fully explored.

Accurate spectral analysis can reveal non-radial components.

Non-standard effects like heavy element enhancement are considered.

Abstract

Current status of (the lack of) understanding Blazhko effect is reviewed. We focus mostly on the various components of the failure of the models and touch upon the observational issues only at a degree needed for the theoretical background. Attention is to be paid to models based on radial mode resonances, since they seem to be not fully explored yet, especially if we consider possible non-standard effects (e.g., heavy element enhancement). To aid further modeling efforts, we stress the need for accurate time-series spectral line analysis to reveal any possible non-radial component(s) and thereby let to include (or exclude) non-radial modes in explaining the Blazhko phenomenon.