论文标题
瓦解的旧开放集群Czernik 3
The disintegrating old open cluster Czernik 3
论文作者
论文摘要
我们通过使用Tircam2在3.6m的Devasthal光学望远镜上使用TiRCAM2和最近可用的高质量的高质量运动数据，对Czernik 3（CZ3）开放群集进行了详细的分析。该簇具有高度伸长的形态，并具有恒星的分形分布。群集的核心和簇半径估计为0.5 PC和1.2 PC。我们使用{\ it gaia}正确的运动数据确定了45颗星为群集成员。群集的距离和年龄分别为$ 3.5 \ pm0.9 $ kpc和$ 0.9^{+0.3} _ { - 0.1} $ gyr。群集区域中质量函数$`γ'$的坡度，在质量范围$ \ sim $ 0.95 $ <$ m $ $ _ $ _ \ odot $ 4 <$ 2.2，被发现为$ -1.01 \ pm0.43 $。群集显示质量分化的特征，并动态放松（动态年龄= 10 Myr）。这及其尺寸较小，大潮汐半径，低密度/恒星的大分离以及伸长和扭曲的形态，表明CZ3在外部潮汐相互作用的影响下是一个松散结合的分解集合。
We have performed a detailed analysis of the Czernik 3 (Cz3) open cluster by using deep near-infrared photometry taken with TIRCAM2 on 3.6m Devasthal optical telescope along with the recently available high quality proper motion data from the {\it Gaia} DR2 and deep photometric data from Pan-STARRS1. The cluster has a highly elongated morphology with fractal distribution of stars. The core and cluster radii of the cluster are estimated as 0.5 pc and 1.2 pc, respectively. We have identified 45 stars as cluster members using the {\it Gaia} proper motion data. The distance and age of the cluster are found to be $3.5\pm0.9$ kpc and $0.9^{+0.3}_{-0.1}$ Gyr, respectively. The slope of the mass function $`Γ'$ in the cluster region, in the mass range $\sim$0.95$<$M/M$_\odot$$<$2.2, is found to be $-1.01\pm0.43$. The cluster shows the signatures of mass-segregation and is dynamically relaxed (dynamical age=10 Myr). This along with its small size, big tidal radius, low density/large separation of stars, and elongated and distorted morphology, indicate that the Cz3 is a loosely bound disintegrating cluster under the influence of external tidal interactions.
