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

A photometric monitoring of bright high-amplitude Scuti stars

I. The double-mode pulsation of V567 Ophiuchi

L. L. Kiss^{1, 2}, A. Derekas¹, Sz. Mészáros^{1, 3} and P. Székely<sup>1

1</sup>  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)

Abstract
We present the first results of an observational project, which addresses the period changing behaviour of a sample of high-amplitude 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 -- Sct -- stars: individual: V567 Oph

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

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