The Blazhko effect of AR Herculis

V-band observations of the RR Lyrae star AR Her were obtained in 1992 and 1 994-1995. During these years, AR Her continued to exhibit a strong Blazhko effect, showing light-curve variations more complex than pure amplitude mod ulation. The light curves of AR Her in 1992 and 1995 were modeled and compa red with prior results. The light curve of AR Her is not a simple superposi tion of the light curves of an RRab and an RRc star. AR Her is therefore no t, as has been suggested, a composite system made of an RRab and an RRc com ponent. Coincident changes in primary and Blazhko period have been reported for some Blazhko variables. These period changes may possibly occur in AR Her, but stronger evidence for them has been seen in other stars. These cha nges suggest that the Blazhko period is not always equal to the rotation pe riod of a star showing the Blazhko effect, in contradiction to recent rotat or-pulsator models.