论文标题
偏眼的二进制文件中的偏心轨道和Apsidal运动EK CEP和HS她
Eccentric orbits and apsidal motion in the eclipsing binaries EK Cep and HS Her
论文作者
论文摘要
我们基于新的，基于地面的CCD多色光曲线以及苔丝观测，径向速度曲线和Eclipse时正时测量值，对两个年轻的，EK CEP和HS进行了首次现代分析。恒星的轨道和恒星参数由Roche建模确定，并使用等速线和进化轨道的网格检查其进化状态。我们发现HS她的年龄为25-32 Myr，其组件在零时代的主序列上。在16-20岁的Myr时，EK CEP的主要也位于ZAMS上，但其次要是预序列的恒星。两种二进制文件都有略微偏心的轨道，并显示Apsidal运动。基于更新的日食时间和光谱证据，我们排除了HS HS中先前假设的三级成分的存在。
We present the first modern analysis of two young, eclipsing binaries, EK Cep and HS Her, based on new, ground-based, CCD multicolour light curves as well as the TESS observations, radial velocity curves, and eclipse timing measurements. The orbital and stellar parameters of the stars are determined by Roche modelling, and their evolutionary status is examined using a grid of isochrones and evolutionary tracks. We find that HS Her is 25-32 Myr old and its components are on the zero-age main sequence; at the age of 16-20 Myr, the primary of EK Cep is also on the ZAMS, but its secondary is a pre-main-sequence star. Both binaries have slightly eccentric orbits and display apsidal motion. Based on updated eclipse timings and spectroscopic evidence, we rule out the presence of a previously hypothesized tertiary component in HS Her.
