论文标题
光学线性极化研究针对Czernik 3在不同的空间尺度上开放群集
Optical linear polarization study towards Czernik 3 open cluster at different spatial scales
论文作者
论文摘要
我们介绍了恒星的光学线性极化观察到Sloan I波段中Czernik 3簇的核心。使用Abu山观测站的1.2 M望远镜上的Empol仪器获得数据。我们通过将两极分化观察结果与Gaia EDR3，Wise和HI，$^{12} $ CO Surveys的数据结合起来，研究了该集群的尘埃分布。此外，我们还使用了Czernik 3的15 $^\ Circ $内的先前研究簇的偏光数据来了解大规模的灰尘分布。 Czernik 3的观察结果显示在极化程度上的范围很大，表明灰尘也不均匀地分布在天空平面上，即使是小规模也是如此。使用从GAIA EDR3星形统计的核心区域中的成员恒星，到Czernik 3的距离限制为$ 3.6 \ pm0.8 $ kpc。这使其成为迄今为止光学极化观察到的最遥远的簇之一。观察到的极化程度和朝向该集群方向灭绝的变化表明，在$ \ sim 1 $ kpc和$ \ sim 3.4 $ kpc的距离处至少存在两个尘埃层。从极化程度和明智的W4通量的增加可以看出，簇中心存在灰尘。大规模的灰尘分布揭示了当地手臂和珀尔修斯臂之间存在低灰尘含量的区域。
We present the optical linear polarization observation of stars towards the core of the Czernik 3 cluster in the Sloan i-band. The data were obtained using the EMPOL instrument on the 1.2 m telescope at Mount Abu Observatory. We study the dust distribution towards this cluster by combining the results from our polarization observations with the data from Gaia EDR3, WISE, and the HI, $^{12}$CO surveys. In addition, we use the polarimetric data of previously studied clusters within 15$^\circ$ of Czernik 3 to understand the large scale dust distribution. The observational results of Czernik 3 show a large range in the degree of polarization, indicating that the dust is not uniformly distributed over the plane of the sky, even on a small scale. The distance to the Czernik 3 is constrained to $3.6\pm0.8$ kpc using the member stars in the core region identified from Gaia EDR3 astrometry. This makes it one of the most distant clusters observed for optical polarization so far. The variation of observed degree of polarization and extinction towards this cluster direction suggests the presence of at least two dust layers along this line of sight at distances of $\sim 1$ kpc and $\sim 3.4$ kpc. There is an indication of the presence of dust in the centre of the cluster, as seen from an increase in the degree of polarization and WISE W4 flux. The large scale distribution of dust reveals the presence of a region of low dust content between the local arm and the Perseus arm.
