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Astron. Astrophys. 326, L1-L4 (1997)
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
Abstract
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]](img1.gif)
), first (![[FORMULA]](img2.gif)
)
and second (![[FORMULA]](img3.gif)
) overtone pulsation modes as well as
non-linear coupling terms (![[FORMULA]](img4.gif)
and
![[FORMULA]](img5.gif)
). The new variable's period ratio
![[FORMULA]](img6.gif)
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
Contents
- 1. Introduction
- 2. Observations and analysis
- 3. Period changes
- 4. Discussion
- 5. Acknowledgements
- References
© European Southern Observatory (ESO) 1997
Online publication: April 20, 1998
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