The eclipsing delta-Scuti star HD 172189 is a probable member of the opencluster IC 4756 and a promising candidate target for the CoRoT mission. The detection of pulsation modes is the first step in the asteroseismologicalstudy of the star. Further, the calculation of the orbital parameters of thebinary system allows us to make a dynamical determination of the mass of thestar, which works as an important constraint to test and calibrate theasteroseismological models. From a detailed frequency analysis of 210 hours of photometric data of HD172189 obtained from the STEPHI XIII campaign we have identified six pulsationfrequencies with a confidence level of 99% and a seventh with a 65% confidencelevel in the range between 100-300 uHz. In addiction, three eclipses wereobserved during the campaign, allowing us to improve the determination of theorbital period of the system.
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机译：黯然失色的斯库提星HD 172189是opencluster IC 4756的可能成员，也是CoRoT任务的有希望的候选目标。脉动模式的检测是恒星星震学研究的第一步。此外，双星系统轨道参数的计算使我们能够动态确定恒星的质量，这是测试和校准流变地震学模型的重要约束。通过对从STEPHI XIII活动获得的HD172189的210小时光度数据的详细频率分析，我们确定了100-300 uHz范围内的六个脉动频率，置信度为99％，第七个脉动频率的置信度为65％。在成瘾期间，在竞选期间观察到了3次日食，这使我们能够改善对系统定轨周期的确定。
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