We present the first results of an observational project, which addresses theperiod changing behaviour of a sample of high-amplitude delta Scuti stars. Inthis paper we discuss the double-mode nature of V567 Ophiuchi. It was observedon 15 nights in two consecutive years in order to resolve the long-standingambiguity related to its secondary period. A frequency analysis of almost 5000individual single-filtered CCD V measurements resulted in two independentfrequencies (f_1=6.6879 c/d and f_2=11.8266 c/d) with a ratio of f_1/f_2=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. Possibleasteroseismological implications are briefly discussed.
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机译：我们介绍了一个观测项目的第一个结果，该项目解决了高振幅δScuti星样本的周期变化行为。在本文中，我们讨论了V567 Ophiuchi的双模性质。为了解决与中学时期有关的长期歧义，连续两年在15个晚上进行观测。对近5000个单个CCD V单次测量的频率进行了频率分析，结果得出两个独立的频率（f_1 = 6.6879 c / d和f_2 = 11.8266 c / d），其比率为f_1 / f_2 = 0.565。优化主导时期，再分析支持次要时期的存在。简要讨论了可能的地震学意义。
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