AI 中文总结
研究球状星团中双星分数径向分布的演化，通过蒙特卡罗模拟，发现多种群球状星团的多尺度结构对双峰分布起源起关键作用，证明双星可作动力学示踪剂，揭示其与星团动力学年龄及分布最小值径向位置的关系。
AI 中文摘要
球状星团中多个恒星群体所处的不同动力学环境在星团演化的许多方面都起着重要作用，包括双星的动力学。最近对银河系球状星团的观测分析揭示了双星分数的双峰径向趋势：双星分数在星团的中心和外围区域都有所增强，在星团的中间区域有明显的最小值。在本文中，我们研究了这一特征的动力学起源以及在星团寿命的延长部分维持这种双峰性的机制。我们利用了一组蒙特卡罗模拟，跟踪单种群和多种群球状星团的长期动力学演化。我们研究了质量分离和双星破坏如何共同作用产生双峰分布，并表明虽然单种群星团可以短暂地产生类似的分布，但效果微弱且短暂。相反，我们表明与多个恒星群体存在相关的结构特性显著加强并维持了双峰性。我们还表明，长期动力学演化的影响推动了星团动力学年龄与双星分数最小值径向位置之间的广泛关系，该最小值往往会随着时间向外迁移。总体而言，我们的结果强烈表明，多种群球状星团的典型多尺度结构（最初以嵌入更扩展的第一种群系统中的第二种群恒星的密集且集中在中心的子系统为特征）在观测到的双峰分布的起源中起着关键作用，并且它们进一步证明了双星作为球状星团形成和动力学演化的动力学示踪剂的分析能力。
英文摘要
The distinct dynamical environments occupied by multiple stellar populations in globular clusters play a significant role in many aspects of cluster evolution, including the dynamics of binary stars. Recent observational analyses of Galactic globular clusters have revealed a bimodal radial trend in the binary fraction: the fraction of binaries is enhanced in both the central and outer regions of clusters, with a noticeable minimum in the cluster's intermediate regions. In this paper, we investigate the dynamical origin of this feature and the mechanisms responsible for preserving this bimodality for an extended portion of a cluster's lifetime. We utilize a suite of Monte Carlo simulations that follow the long-term dynamical evolution of both single-population and multiple-population globular clusters. We investigate how mass segregation and binary disruption function cohesively to produce a bimodal profile, and show that although single-population clusters can briefly generate a similar profile, the effect is weak and transient. Conversely, we show that the structural properties associated with the presence of multiple stellar populations significantly strengthen and preserve the bimodality. We also show that the effects of long-term dynamical evolution drive a broad relationship between a cluster's dynamical age and the radial location of the binary fraction minimum, which tends to migrate outward over time. Overall, our results strongly indicate that the typical multi-scale structure of multiple-population globular clusters (initially characterized by a dense and centrally concentrated subsystem of second-population stars embedded in a more extended first-population system) plays a key role in the origin of the observed bimodal profiles and they further demonstrate the analytical power of binary stars as dynamical tracers of globular cluster formation and dynamical evolution.
Comments7 pages, 7 figures, accepted for publication in A&A
