论文标题
“动力时钟”：与蓝色Straggler星星恒星簇的内部动力学演变约会
The "dynamical clock": dating the internal dynamical evolution of star clusters with Blue Straggler Stars
论文作者
论文摘要
我们在使用该恒星种群作为高密度恒星系统中发生的动力学过程的框架中，讨论了特殊类别的对象（所谓的“蓝色Straggler Star”，BSSS，BSSS）的观察特性。实际上，BSS径向分布的形状及其中心浓度水平是自从形成以来宿主群集达到的动力学进化阶段的强大示踪剂。因此，它们可以用作能够测量恒星系统动态时代的经验时间表。此外，在颜色磁性图中存在双BSS序列的存在可能是球状群集寿命中最极端动态过程的标志：核心塌陷事件。因此，这样的功能可用于揭示此过程的发生，甚至首次将其日期日期。
We discuss the observational properties of a special class of objects (the so-called "Blue Straggler Stars", BSSs) in the framework of using this stellar population as probe of the dynamical processes occurring in high-density stellar systems. Indeed, the shape of the BSS radial distribution and their level of central concentration are powerful tracers of the stage of dynamical evolution reached by the host cluster since formation. Hence, they can be used as empirical chronometers able to measure the dynamical age of stellar systems. In addition, the presence of a double BSS sequence in the color-magnitude diagram is likely the signature of the most extreme dynamical process occurring in globular cluster life: the core collapse event. Such a feature can therefore be used to reveal the occurrence of this process and, for the first time, even date it.
