动态演化小van den Bergh-Hagen疏散星团的综合光度研究
A comprehensive photometric study of dynamically evolved small van den Bergh-Hagen open clusters
摘要：
本文给出了7个vdBH（vdBH）疏散星团（vdBH 1，1，10，31，72，87，92和118）的$UBV$，$RI$和$CT_1T_2$光度测量结果.高质量的，多波段光度数据集被用来跟踪集群恒星密度径向分布，并建立颜色星等图（CMD）和颜色（CC）图，我们估计其结构参数和基本天体物理性质。在我们的样本中的集群覆盖了广泛的年龄范围，从$\sim$ 60万年到2.8 Gyr，是相对较小的大小（$\sim$ 1 $-$ 6 pc），并放置在距离太阳的变化之间的距离1.8和6.3千秒差距，分别。我们还估计了集群目前的质量以及半质量弛豫时间（$t_r$）的下限。结合结构参数值的结果表明，所研究的集群是在先进的阶段，其内部的动力学演化（年龄/ $t_r$ $\sim$ 20 $-$ 320），可能在典型的阶段，潮汐充满质量偏析在其核心区域。与太阳附近的疏散星团相比，七个vdBH星团的质量更大（$\sim$ 80 $-$ 380 $M_\odot$），浓度参数值更高（$c$ $\sim$ 0.75 $-$ 1.15）和动态演化的。
英文摘要：
We present results from Johnson $UBV$, Kron-Cousins $RI$ and Washington $CT_1T_2$ photometries for seven van den Bergh-Hagen (vdBH) open clusters, namely, vdBH\,1, 10, 31, 72, 87, 92, and 118. The high-quality, multi-band photometric data sets were used to trace the cluster stellar density radial profiles and to build colour-magnitude diagrams (CMDs) and colour-colour (CC) diagrams from which we estimated their structural parameters and fundamental astrophysical properties. The clusters in our sample cover a wide age range, from $\sim$ 60 Myr up to 2.8 Gyr, are of relatively small size ($\sim$ 1 $-$ 6 pc) and are placed at distances from the Sun which vary between 1.8 and 6.3 kpc, respectively. We also estimated lower limits for the cluster present-day masses as well as half-mass relaxation times ($t_r$). The resulting values in combination with the structural parameter values suggest that the studied clusters are in advanced stages of their internal dynamical evolution (age/$t_r$ $\sim$ 20 $-$ 320), possibly in the typical phase of those tidally filled with mass segregation in their core regions. Compared to open clusters in the solar neighbourhood, the seven vdBH clusters are within more massive ($\sim$ 80 $-$ 380$M_\odot$), with higher concentration parameter values ($c$ $\sim$ 0.75$-$1.15) and dynamically evolved ones.
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