论文标题
KIC 12268220：A $δ$ Scuti脉动星和活跃的protohelium白矮人在磨损的二进制系统中
KIC 12268220: A $δ$ Scuti Pulsating Star and an Active Protohelium White Dwarf in an Eclipsing Binary System
论文作者
论文摘要
我们提出了对Algol-type黯然失色的二进制KIC 12268220的光度，光谱，呼吸酶学和进化分析。我们发现O'Connell效应和kepler光曲线中的反相关的蚀时间变化，从而揭示了大星空的存在。径向速度和大气参数是从地面光谱观测中获得的。结合径向速度测量值和GAIA衍生的总发光度，我们的光曲线建模可为主要成分和二级成分的物理参数提供解决方案。我们发现$δ$ SCUTI主要产生的14个独立频率，并且观察到的频率与非绝热计算的不稳定模式的频率范围一致。基于以前文献的结论，我们运行了模型网格来研究系统的演化过程。我们模型的进化轨道表明，低质量（$ \ sim 0.23 \，m_ \ odot $）的次级进化出了与R CMA型系统相似的进化状态，该系统可能会演变为EL CVN系统。
We present a photometric, spectroscopic, asteroseismic, and evolutionary analysis of the Algol-type eclipsing binary KIC 12268220. We find the O'Connell effect and anticorrelated eclipse timing variations in the Kepler light curve, revealing the presence of large starspots. Radial velocities and atmospheric parameters are obtained from ground-based spectroscopic observations. Combined with the radial velocity measurements and Gaia-derived total luminosity, our light-curve modeling yields the solution of the physical parameters for both the primary and secondary components. We find 14 independent frequencies arising from the $δ$ Scuti primary, and the observed frequencies agree with the frequency range of unstable modes from nonadiabatic calculations. Based on the conclusion from previous literature, we run a grid of models to study the evolution process of our system. The evolutionary tracks of our model suggest that the low-mass ($\sim 0.23\,M_\odot$) evolved secondary shows a similar evolutionary state to the R CMa-type system, which might evolve to an EL CVn system.
