论文标题
NGC $ \，$ 419周围的运动学复杂性：解决集群的适当运动，小麦哲伦云和麦哲伦桥
Kinematic complexity around NGC$\,$419: resolving the proper motion of the cluster, the Small Magellanic Cloud and the Magellanic Bridge
论文作者
论文摘要
我们提出$ \ it {hubble} $ $ \ it {space} $ $ \ it {telescope} $在小麦芽岩中的星团ngc $ \，$ 419的方向上适当的运动。由于我们的测量值很高，因此首次可以解决位于现场的恒星种群的复杂运动学，甚至沿切向方向。实际上，我们测量的适当动作使我们能够分开簇星，平均以（$μ_α\cosΔ^{\ rm ngc \，419}，μ_Δ^{\ rm ngc \，419} $ 419} $）=（$+0.878 \ pm0.878 \ pm0.0555555 $，$，$ -1.1.246）。 yr $^{ - 1} $，来自小麦芽云的云以及属于第三个运动学功能的云层，我们将其视为麦哲伦桥的一部分。解决这样的运动学复杂性，可以构建污染的颜色象征图，以及测量三个单独组件的绝对正确运动。因此，我们的研究为通过利用其恒星簇的分辨运动学而动态研究麦哲伦系统的可能性设定了第一步。
We present $\it{Hubble}$ $\it{Space}$ $\it{Telescope}$ proper motions in the direction of the star cluster NGC$\,$419 in the Small Magellanic Cloud. Because of the high precision of our measurements, for the first time it is possible to resolve the complex kinematics of the stellar populations located in the field, even along the tangential direction. In fact, the proper motions we measured allow us to separate cluster stars, which move on average with ($μ_α\cosδ^{\rm NGC\,419}, μ_δ^{\rm NGC\,419}$) = ($+0.878\pm0.055$, $-1.246\pm0.048$) mas yr$^{-1}$, from those of the Small Magellanic Cloud and those belonging to a third kinematic feature that we recognise as part of the Magellanic Bridge. Resolving such a kinematic complexity enables the construction of decontaminated colour-magnitude diagrams, as well as the measurement of the absolute proper motion of the three separate components. Our study therefore sets the first steps towards the possibility of dynamically investigating the Magellanic system by exploiting the resolved kinematics of its stellar clusters.
