论文标题
活跃的早期K型接触系统的全面光度研究-IL CNC
Comprehensive Photometric Investigation of an Active Early K-type Contact System -- IL Cnc
论文作者
论文摘要
对早期K型接触二进制-IL CNC进行了全面的光度研究。获得（或下载），然后详细分析了地面望远镜和开普勒空间望远镜的几条光曲线。它们主要发现它们是不对称的，并且从开普勒K2数据的光曲线中，O'Connell效应甚至不断变化，这表明该系统具有高度活性。使用Wilson-Devinney代码（2013年版），得出了光度法解决方案，然后进行了比较。发现质量比的计算很容易受到斑点设置的影响。结合了从lamost中值分辨率数据确定的径向速度，发现二进制组件的质量比为$ m_2/m_1 = 1.76 \ pm 0.05 $。组件处于浅触点（$ f \ sim 9 \％$），温度差约为$ t_2 -t_1 = -280 \ pm 20 $k。证明该系统是W -SubType，这可能是K -Type触点二进制组的常见功能。估计二进制组件的质量为$ M_1 \ sim 0.51 $ m $ _ {sun} $和$ m_2 \ sim 0.90 $ m $ _ {sun {sun} $。这些值与GAIA的视差数据得出的值非常吻合。结果表明，与零主序列相比，主要成分缺乏光度。发现主要组件的H $α$光谱线很奇特。将新确定的最小光线与从文献中收集的最低光时结合在一起，研究了IL CNC的轨道周期。发现主要最小值的（o $ - $ c）s显示正弦变化，而次要则没有。振荡更有可能是由星形活动引起的。然而，这个假设需要更多数据来支持。
Comprehensive photometric investigation was carried out to the early K-type contact binary - IL Cnc. A few light curves from both ground-based telescopes and the Kepler space telescope were obtained (or downloaded) and then analyzed in detail. They are mostly found to be asymmetric and there are even continuously changing O'Connell effect in the light curves from Kepler K2 data, suggesting the system to be highly active. Using the Wilson-Devinney code (version 2013), photometric solutions were derived and then compared. It is found that the calculation of the mass ratio is easily affected by the spot settings. Combining the radial velocities determined from LAMOST median resolution spectral data, the mass ratio of the binary components is found to be $M_2/M_1 = 1.76\pm 0.05$. The components are in shallow contact ($f\sim 9\%$) and have a temperature difference about $T_2 - T_1 = -280\pm 20$ K. The system is demonstrated to be W-subtype, which may be a common feature of K-type contact binaries. The masses of the binary components were estimated to be $M_1\sim 0.51$ M$_{sun}$ and $M_2\sim 0.90$ M$_{sun}$. The values are in good agreement with that deduced from the parallax data of Gaia. The results suggest that the primary component lacks luminosity compared with the zero main sequence. The H$α$ spectral line of the primary component is found to be peculiar. Combining newly determined minimum light times with those collected from literature, the orbital period of IL Cnc is studied. It is found that the (O$-$C)s of the primary minima show sinusoidal variation while the secondary do not. The oscillation is more likely to be caused by the starspot activities. Yet this assumption needs more data to support.
