三元系统V819，V2388 Oph和V1031 Ori的研究
The study of triple systems V819 Her, V2388 Oph, and V1031 Ori
摘要：
V819 Her，V2388 Oph和V1031 Ori是由一个食双星组成的三重双星，其轨道较长，具有远可见光。对这些有趣的系统进行了详细的分析，结合了两种观测技术：干涉测量和视周期变化。在上个世纪获得的这三个系统的干涉测量数据确定了系统中遥远组件的可见轨道。位置测量的组合分析与食双星的视周期变化的分析（使用最小计时）可以用来研究这些系统在一个组合的方法，导致一组参数，否则无法获得没有径向速度。这里提出的技术的主要优点是，一个不需要光谱监测的视觉轨道，这有相当长的周期：5.5年的V819 Her，9.0年的V2388 Oph，和31.3年的V1031猎户座，分别。外轨道的偏心率分别为0.69、0.33和0.92。此外，使用食对的最小定时帮助我们推导出轨道在空间中的方向，而不会在天平面周围产生模糊。最后，组合分析还产生了V819 Her（68.7 +/- 1.8 pc）和V2388 Oph（70.6 +/- 8.9 pc）距离的独立测定。我们还提供了一个类似系统的列表，这些系统适用于像这样的组合分析。
英文摘要：
The systems V819 Her, V2388 Oph, and V1031 Ori are triples comprised of an eclipsing binary orbiting with a distant visual component on a longer orbit. A detailed analysis of these interesting systems, combining the two observational techniques: interferometry and apparent period variation, was performed. The interferometric data for these three systems obtained during the last century determine the visual orbits of the distant components in the systems. The combined analysis of the positional measurements together with the analysis of apparent period changes of the eclipsing binary (using the minima timings) can be used to study these systems in a combined approach, resulting in a set of parameters otherwise unobtainable without the radial velocities. The main advantage of the technique presented here is the fact that one needs no spectroscopic monitoring of the visual orbits, which have rather long periods: 5.5 yr for V819 Her, 9.0 yr for V2388 Oph, and 31.3 yr for V1031 Ori, respectively. The eccentricities of the outer orbits are 0.69, 0.33, and 0.92, respectively. Moreover, the use of minima timings of the eclipsing pairs help us to derive the orientation of the orbit in space with no ambiguity around the celestial plane. And finally, the combined analysis yielded also an independent determination of the distance of V819 Her (68.7 +/- 1.8 pc), and V2388 Oph (70.6 +/- 8.9 pc). We also present a list of similar systems, which would be suitable for a combined analysis like this one.
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