论文标题
TZ Fornacis差异核和潮汐演化的探索性场景
Exploratory scenarios for the differential nuclear and tidal evolution of TZ Fornacis
论文作者
论文摘要
TZ Fornacis是一个双线截止的二进制系统,具有相似的质量(2.057 $ \ pm $ 0.001和1.958 $ \ pm $ 0.001 $ M _ {\ odot} $),但以不同的半径为特征在质量方面的相似性使得可以研究系统的差异恒星进化以及其潮汐进化的某些方面。关于其轨道元素,最近证实其轨道是圆圆的,轨道周期为75.7天。较小的分量旋转速度的速度比主要轨道速度同步的主要速度约为17倍。这项工作的主要目标是研究系统的核和潮汐演化。我们探索了有关初始偏心率的两种情况:高(0.30)和一个初始圆形轨道的情况。在偏心率,同步水平和轨道周期的观察值与通过潮汐进化方程的整合所预测的值之间发现了良好的一致性。这里还研究了摩擦时间尺度对TZ轨道元素进化的影响。受摩擦时间尺度中不确定性影响最大的轨道元素是两个组成部分的同步级别。另一方面,我们将Granada代码生成的旋转模型的属性用作初始角速度,而不是使用试验值。在这种情况下,轨道元素的理论值及其观察到的对应物之间的比较也导致了良好的互合。
TZ Fornacis is a double-lined eclipsing binary system with similar masses (2.057$\pm$0.001 and 1.958$\pm$0.001 $M_{\odot}$) but characterized by very different radii (8.28$\pm$0.22 and 3.94$\pm$0.17 $R_{\odot}$). This similarity in terms of mass makes it possible to study the system's differential stellar evolution as well as some aspects of its tidal evolution. With regard to its orbital elements, it was recently confirmed that its orbit is circular with an orbital period of 75.7 days. The less massive component rotates about 17 times faster than the primary one, which is synchronized with the mean orbital angular velocity. Our main objective in this work is to study both the nuclear and the tidal evolution of the system. We explored two scenarios regarding the initial eccentricities: a high one (0.30) and a case of an initial circular orbit. A good agreement has been found between the observational values of the eccentricity, synchronism levels, and orbital period with the values predicted by the integration of the tidal evolution equations. The influence of the friction timescale on the evolution of the orbital elements of TZ For is also studied here. The orbital elements most affected by the uncertainties in the friction timescale are the synchronism levels of the two components. On the other hand, we used the properties of the rotating models generated by the GRANADA code as the initial angular velocities instead of using trial values. In this case, comparisons between the theoretical values of the orbital elements and their observed counterparts also lead to a good interagreement.