Revisit of Open Clusters UPK 39, UPK 41, and PHOC 39: A New Binary Open Cluster Found
Revisit of Open Clusters UPK 39, UPK 41, and PHOC 39: A New Binary Open Cluster Found
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DOI：
10.3847/1538-3881/ac8545
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发表时间：
2022-07
期刊：
影响因子：
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通讯作者：
X. Ye;Jingkun Zhao;T. Oswalt;Yong Yang;Gang Zhao
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作者：
X. Ye;Jingkun Zhao;T. Oswalt;Yong Yang;Gang Zhao
我们研究了天鹰裂谷云附近的三个疏散星团，Sim 等人将其命名为 UPK 39（以下简称 c1）、UPK 41（以下简称 c2）。 (2019) 和 Hunt & Reffert (2021) 中的 PHOC 39（以下简称 c3）。使用 Gaia DR3 的光度通范围、变红和消光，我们构建了颜色绝对幅度图。使用等时线拟合，他们的年龄估计为 6.3 ± 0.9、8.1 ± 1.4 和 21.8 ± 2.2 Myr。使用盖亚和 LAMOST 的数据估计，它们的自行和径向速度非常相似。从它们的轨道、不同时刻的相对距离、运动学、年龄和金属丰度，我们得出结论，c1和c2是原初双疏散星团，它们很可能是同时形成的，而c3可能在未来捕获c1、c2。
We investigate the three open clusters near the Aquila Rift cloud, named UPK 39 (c1 hereafter), UPK 41 (c2 hereafter) in Sim et al. (2019), and PHOC 39 (c3 hereafter) in Hunt & Reffert (2021). Using photometric passpands, reddening, and extinction from Gaia DR3, we construct the color-absolute-magnitude diagram. Using isochrone fits, their ages are estimated as 6.3 ± 0.9, 8.1 ± 1.4 and 21.8 ± 2.2 Myr. Their proper motions and radial velocities, estimated using data from Gaia and LAMOST, are very similar. From their orbits, relative distances among them at different times, kinematics, ages, and metallicities, we conclude that c1 and c2 are primordial binary open cluster, which are likely to have been formed at the same time, and c3 may capture c1, c2 in the future.