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 (P_0_=0.66887d), first (P_1_=0.51265d) and second (P_2_=0.41103d) overtone pulsation modes as well as non-linear coupling terms (1/P_1_+1/P_0_ and 1/P_1_-1/P_0_). The new variable's period ratio P_1_/P_0_=0.7664 considerably exceeds those typical for bimodal RR Lyr type stars and the ratio observed for AC And.
Astronomy and Astrophysics
- Pub Date:
- October 1997
- STARS: OSCILLATIONS;
- STARS: INDIVIDUAL: GSC 4018.1807