Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...326l...1a&link_type=abstract
Astronomy and Astrophysics, v.326, p.L1-L4
Astronomy and Astrophysics
Astrophysics
12
Stars: Oscillations, Stars: Individual: Gsc 4018.1807
Scientific paper
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.
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