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In an extended photometric campaign of RR Lyrae variables of the globularcluster M3, an aberrant light-curve, non-Blazhko RRab star, V123, was detected.Based on its brightness, colors and radial velocity curve, V123 is a bona fidemember of M3. The light curve of V123 exhibits neither a bump preceding lightminimum, nor a hump on the rising branch, and has a longer than normal risetime, with a convex shape. Similar shape characterizes the mean light curves ofsome large-modulation-amplitude Blazhko stars, but none of the regular RRabvariables with similar pulsation periods. This peculiar object thus mimicsBlazhko variables without showing any evidence of periodic amplitude and/orphase modulation. We cannot find any fully convincing answer to the peculiarbehavior of V123, however, the phenomenon raises again the possibility thatrotation and aspect angle might play a role in the explanation of the Blazhkophenomenon, and some source of inhomogeneity acts (magnetic field, chemicalinhomogeneity) that deforms the radial pulsation of Blazhko stars during themodulation.

What is the difference? Blazhko and non-Blazhko RRab stars and the special case of V123 in M3