疏散星团Casado Alessi 1的光学线偏振
Optical Linear Polarization toward the Open Star Cluster Casado Alessi 1
摘要：
我们目前的B-，V-，R-和I-波段的线性偏振观测的73颗恒星的疏散星团Casado Alessi 1（以下简称Alessi 1）的方向。我们的目标是使用偏振测量作为一种工具来调查的性质和分布的尘埃颗粒对集群的方向。使用安装在印度奈尼塔尔ARIES的104厘米望远镜上的ARIES成像偏振计进行偏振观测。利用盖亚光度计数据，我们估计该星团的年龄和距离分别为$0.8\pm0.1$ Gyr和$673\pm98$ pc。总共有66颗半径为26弧分的恒星被确定为星团的成员。在这66个成员中，有15颗恒星被观测到具有相同的偏振值。该区域的大多数恒星都遵循星际介质的一般偏振定律，这表明朝向星团Alessi 1的偏振主要是由前景尘埃颗粒控制的。最大偏振度（$P_{max}$）和对应于最大偏振度的波长（$λ_{max}$）的平均值分别为$0.83\pm0.03$ %和$0.59\pm0.04$ $μ$ m。此外，朝向星团的尘埃颗粒似乎是排成一行的，这可能是由于银河系的磁场。
英文摘要：
We present B-, V-, R-, and I-bands linear polarimetric observations of 73 stars in the direction of open star cluster Casado Alessi 1 (hereafter Alessi 1). We aim to use polarimetry as a tool to investigate the properties and distribution of dust grains toward the direction of the cluster. The polarimetric observations were carried out using the ARIES IMaging POLarimeter mounted at the 104 cm telescope of ARIES, Nainital (India). Using the Gaia photometric data the age and distance of the cluster are estimated to be $0.8\pm0.1$ Gyr and $673\pm98$ pc, respectively. A total of 66 stars with a 26 arcmin radius from the cluster are identified as members of the cluster using the astrometric approach. Out of these 66 members, 15 stars were observed polarimetrically and found to have the same value of polarization. The majority of the stars in the region follow the general law of the polarization for the interstellar medium, indicating that polarization toward the cluster Alessi 1 is dominated by foreground dust grains. The average values of the maximum polarization ($P_{max}$) and the wavelength corresponding to the maximum polarization ($λ_{max}$) toward the cluster are found to be $0.83\pm0.03$% and $0.59\pm0.04$ $μ$m, respectively. Also, dust grains toward the cluster appear to be aligned, possibly due to the galactic magnetic field.
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