EDP Sciences
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Volume 394, Number 3, November II 2002
Page(s) 943 - 948
Section Formation, structure and evolution of stars
DOI http://dx.doi.org/10.1051/0004-6361:20021201

A&A 394, 943-948 (2002)
DOI: 10.1051/0004-6361:20021201

A photometric monitoring of bright high-amplitude $\delta$ Scuti stars

I. The double-mode pulsation of V567 Ophiuchi
L. L. Kiss1, 2, A. Derekas1, Sz. Mészáros1, 3 and P. Székely1

1  Department of Experimental Physics and Astronomical Observatory, University of Szeged, Dóm tér 9, Szeged 6720, Hungary
2  Hungarian Eötvös Fellowship, Instituto de Astrofísica de Andalucía, CSIC, Granada, Spain
3  Department of Optics and Quantum Electronics, University of Szeged, POB 406, Szeged 6701, Hungary

(Received 12 July 2002 / Accepted 13 August 2002)

We present the first results of an observational project, which addresses the period changing behaviour of a sample of high-amplitude $\delta$ Scuti stars. In this paper we discuss the double-mode nature of V567 Ophiuchi. It was observed on 15 nights in two consecutive years in order to resolve the long-standing ambiguity related to its secondary period. A frequency analysis of almost 5000 individual single-filtered CCD V measurements resulted in two independent frequencies ( f1=6.6879 d -1 and f2=11.8266 d -1) with a ratio of f1/f2=0.565. Earlier data taken from the literature were used to refine the dominant period, and the re-analysis supports the existence of the secondary period. Possible asteroseismological implications are briefly discussed.

Key words: stars: variables: general -- stars: oscillations -- $\delta$ Sct -- stars: individual: V567 Oph

Offprint request: L. L. Kiss, l.kiss@physx.u-szeged.hu

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