Letter to the Editor
On the new triple-mode pulsating variable star GSC 4018.1807
Received 10 March 1997 / Accepted 22 April 1997
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 (), first () and second () overtone pulsation modes as well as non-linear coupling terms ( and ). The new variable's period ratio considerably exceeds those typical for bimodal RR Lyr type stars and the ratio observed for AC And.
Key words: stars: oscillations stars: individual: GSC 4018.1807
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© European Southern Observatory (ESO) 1997
Online publication: April 20, 1998