SIMBAD references

Variability of GSC 4018.1807 was discovered. The new variable is a triple-mode pulsating star, similar to AC And. Our frequency analysis, based on 895 photographic observations, shows that GSC 4018.1807 has the fundamental (P₀=0.66887d), first (P₁=0.51265d) and second (P₂=0.41103d) overtone pulsation modes as well as non-linear coupling terms (1/P₁+1/P₀ and 1/P₁-1/P₀). The new variable's period ratio P₁/P₀=0.7664 considerably exceeds those typical for bimodal RR Lyr type stars and the ratio observed for AC And.