We identify structures of the young star cluster NGC 2232 in the solar neighborhood (323.0 pc) and a newly discovered star cluster, LP 2439 (289.1 pc). Member candidates are identified using the Gaia DR2 sky position, parallax, and proper-motion data by an unsupervised machine-learning method, S tar GO. Member contamination from the Galactic disk is further removed using the color–magnitude diagram. The four identified groups (NGC 2232, LP 2439, and two filamentary structures) of stars are coeval with an age of 25 Myr and were likely formed in the same giant molecular cloud. We correct the distance asymmetry from the parallax error with a Bayesian method. The 3D morphology shows the two spherical distributions of clusters NGC 2232 and LP 2439. Two filamentary structures are spatially and kinematically connected to NGC 2232. Both NGC 2232 and LP 2439 are expanding. The expansion is more significant in LP 2439, generating a loose spatial distribution with sh...

中文翻译：

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气体排出后年轻星团的不同命运

我们确定了太阳附近的年轻恒星团NGC 2232（323.0个）和一个新发现的恒星团LP 2439（289.1个）的结构。使用Gaia DR2的天空位置，视差和自然运动数据，通过无监督的机器学习方法S tar GO来识别候选成员。使用色度图进一步消除了银河系磁盘上的成员污染。四个确定的恒星群（NGC 2232，LP 2439和两个丝状结构）同龄，年龄为25 Myr，很可能形成在同一巨型分子云中。我们用贝叶斯方法校正了视差误差引起的距离不对称。3D形态显示了簇NGC 2232和LP 2439的两个球形分布。两个丝状结构在空间和运动学上连接到NGC 2232。NGC 2232和LP 2439都在扩展。扩展在LP 2439中更为显着，产生了具有松散空间的松散空间分布。