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Astron. Astrophys. 326, L1-L4

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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 =0.7664 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

© European Southern Observatory (ESO) 1997

Online publication: September 9, 1997
Last change: April 20, 1998