论文标题
宽低质量二进制的偏心分布
Eccentricity distribution of wide low-mass binaries
论文作者
论文摘要
使用基于盖亚（Gaia）的El-Badry and Rix（2018）目录研究了太阳能社区中非常宽（10 kau）低质量二进制的偏心率的分布。宽对中的相对运动的方向和速度包含有关偏心分布的统计信息，否则由于很长的轨道时期而无法访问。发现偏心率分布接近线性（热）一个f（e）= 2e $，但是，具有预计分离<200 au的对成对的偏心轨道较少，而对于非常宽的f（e）似乎是稍微超级热的，并且过量的偏心轨道过多。任何宽二元的偏心率都可以使用其运动的方向和速度来统计上受到统计的约束。热偏心分布信号标志着恒星动力学在宽二进制中的形成中的重要作用，尽管磁盘辅助捕获也可以与偏心轨道产生这种对。
Distribution of eccentricities of very wide (up to 10 kau) low-mass binaries in the solar neighborhood is studied using the catalog of El-Badry and Rix (2018) based on Gaia. Direction and speed of relative motions in wide pairs contain statistical information on the eccentricity distribution, otherwise inaccessible owing to very long orbital periods. It is found that the eccentricity distribution is close to the linear (thermal) one f(e) = 2e$ However, pairs with projected separations <200 au have less eccentric orbits, while f(e) for very wide pairs appears to be slightly super-thermal, with an excess of very eccentric orbits. Eccentricity of any wide binary can be constrained statistically using direction and speed of its motion. Thermal eccentricity distribution signals an important role of stellar dynamics in the formation of wide binaries, although disk-assisted capture also can produce such pairs with eccentric orbits.
