论文标题
多中质旋转星团的长期演变
Long-term evolution of multimass rotating star clusters
论文作者
论文摘要
我们研究了多类旋转恒星簇的内部运动学的长期动力学演变。我们进行了一组N体模拟，以遵循不同程度的初始旋转程度的簇的内部演变，并探索了旋转速度的演变，能量等级的程度和速度分布中各向异性。我们的模拟表明：1）随着群集的发展，旋转速度会发展对恒星质量的依赖性，其巨大恒星的特征是旋转更快，而旋转曲线的峰值比低质量恒星更接近簇中心。 2）集群中间区域和外部区域中的能量等级取决于测量速度分散的成分；对于更迅速的旋转簇，向旋转速度的方向向能量均衡的演变更快。 3）速度分布的各向异性对于巨大的恒星更强； 4）质量分离的程度和能量等级的特征是空间各向异性；他们对$ r $和$ z $都有依赖，这与集群密度和速度分散体的空间变化的变平有关，如（$ r $ $ z $）子午线平面的2D地图所示。
We investigate the long-term dynamical evolution of the internal kinematics of multimass rotating star clusters. We have performed a set of N-body simulations to follow the internal evolution of clusters with different degrees of initial rotation and have explored the evolution of the rotational velocity, the degree of energy equipartition, and anisotropy in the velocity distribution. Our simulations show that: 1) as the cluster evolves, the rotational velocity develops a dependence on the stellar mass with more massive stars characterised by a more rapid rotation and a peak in the rotation curve closer to the cluster centre than low-mass stars; 2) the degree of energy equipartition in the cluster's intermediate and outer regions depends on the component of the velocity dispersion measured; for more rapidly rotating clusters, the evolution towards energy equipartition is more rapid in the direction of the rotational velocity; 3) the anisotropy in the velocity distribution is stronger for massive stars; 4) both the degree of mass segregation and energy equipartition are characterised by spatial anisotropy; they have a dependence on both $R$ and $z$, correlated with the flattening in the spatial variation of the cluster's density and velocity dispersion, as shown by 2D maps of the mass segregation and energy equipartition on the ($R$-$z$) meridional plane.
