1996PASP..108..659L

We have obtained new V-band photometry of the RR Lyrae Star V421 Her to test the suggestion of Tsessevich and Mandel (1985) that V421 Her is a double model RR Lyrae with the unusual period ratio of 0.79. We confirm the finding of Tsessevich and Mandel that the light curve of V421 Her is not well described by a single period. However, although the primary period we find agrees well with that of Tsessevich and Mandel, we are unable to confim their 0.43812 day secondary period. Instead, we suggest that V421 Her exhibits the classical Blazhko effect.