用地基成象和Gaia EDR3天体测量对中等年龄疏散星团SAI 35（Juchert 20）的深入研究
A deep study of an intermediate age open cluster SAI 35 (Juchert 20) using ground based imaging and Gaia EDR3 astrometry
摘要：
本文首次报道了对中等年龄疏散星团SAI 35（Juchert 20）的CCD $UBVI$测光研究。为了完成这项研究，我们还使用了LAMOST DR 5，2 MASS和Gaia EDR 3数据库。我们确定了214个最可能的集群成员的成员资格概率高于50%。星团的平均自行为μ_αcosδ=1.10 \pm 0.01和μ_δ=-1.66 \pm 0.01 mas/yr。我们使用各种双色图找到正常的星际消光定律。该星团的年龄、距离、红化和径向速度估计为360 \pm 4000万年、2.9 \pm 0.15千秒差距、0.72 \pm 0.05等和-91.62 \pm 6.39公里/秒。在1.1-3.1 M_（\odot）范围内，主序星的总质量函数斜率为1.49 \pm 0.16，在不确定度范围内与Salpeter的值一致。本研究表明，SAI 35是一个动态松弛。银河系轨道参数是用银河系势模型确定的。我们发现这个物体沿着银河系中心的圆形路径运动。
英文摘要：
We present CCD $UBVI$ photometric study of poorly studied intermediate age open cluster SAI 35 (Juchert 20) for the first time. To accomplish this study, we also used LAMOST DR5, 2MASS, and Gaia EDR3 databases. We identified 214 most probable cluster members with membership probability higher than 50%. The mean proper motion of the cluster is found as μ_αcosδ=1.10 \pm 0.01 and μ_δ=-1.66 \pm 0.01 mas/yr. We find the normal interstellar extinction law using the various two-color diagrams. The age, distance, reddening, and radial velocity of the cluster are estimated to be 360 \pm 40 Myr, 2.9 \pm 0.15 kpc, 0.72 \pm 0.05 mag and -91.62 \pm 6.39 km/sec. The overall mass function slope for main-sequence stars is found to be 1.49\pm0.16 within the mass range 1.1-3.1 M_\odot, which is in agreement with Salpeter's value within uncertainty. The present study demonstrates that SAI 35 is a dynamically relaxed. Galactic orbital parameters are determined using Galactic potential models. We found that this object follows a circular path around the Galactic center.
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