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Astron. Astrophys. 326, L1-L4 (1997)

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Letter to the Editor

On the new triple-mode pulsating variable star GSC 4018.1807

Sergey Antipin

Sternberg Astronomical Institute, Moscow, Russia, 13, University Ave., Moscow 119899, Russia

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 ([FORMULA]), first ([FORMULA]) and second ([FORMULA]) overtone pulsation modes as well as non-linear coupling terms ([FORMULA] and [FORMULA]). The new variable's period ratio [FORMULA] 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

Send offprint requests to: S. Antipin

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© European Southern Observatory (ESO) 1997

Online publication: April 20, 1998