A complete understanding of the formation process of close binaries relies on the reliable determination of their masses and ages, as well as the interior structure of pre-main-sequence (PMS) binaries. PMS eclipsing binaries containing stellar oscillations are therefore benchmarks since the binarity makes it possible to measure the masses and radii independently with great accuracy, while stellar oscillations represent a unique method of probing stellar interiors. Here we report the discovery of KIC 9850387, a short-period PMS eclipsing binary exhibiting hybrid γ Dor- δ Sct pulsations that is also the inner binary of a probable hierarchical triple system. From the light-curve and radial-velocity modeling we determine the masses and radii of the component stars, which suggest the probable PMS nature of the system. Based on four years of Kepler data, the intrinsic oscillations of the star are analyzed. The pulsation spectrum shows 17 low-frequency peaks spaced at exac...

中文翻译：

---

短时内跳的二进制KIC 9850387中内部旋转极慢的主序列γDor-δSct杂种，通过星震学揭示

对紧密二进制文件的形成过程的完全理解取决于对它们的质量和年龄以及主序前（PMS）二进制文件内部结构的可靠确定。包含恒星振荡的PMS蚀二进制文件因此成为基准，因为二元性使得可以独立，高精度地测量质量和半径，而恒星振荡代表了一种探测恒星内部的独特方法。在这里，我们报告了KIC 9850387的发现，KIC 9850387是一种短周期的PMS蚀形二进制，具有混合γDor-δSct脉动，它也是可能的分层三元系统的内部二进制。从光曲线和径向速度模型，我们确定了组成恒星的质量和半径，这暗示了系统可能的PMS性质。根据开普勒的四年数据，分析了恒星的固有振动。脉动频谱显示了17个低频峰，它们相互间隔一定距离。