标题： 奥里昂复合体的运动学研究：从大结构和小结构分析年轻的星团 显示英文标题

标题： Kinematic study of the Orion Complex: Analysing the young stellar clusters from big and small structures

摘要： 在本工作中，我们分析了猎户座恒星形成复合体中具有空间和运动一致性的小质量恒星团。 为了这项研究，我们使用视差、自行和颜色-星等图上的位置选择了预主序星候选样本。 在应用了由盖亚DR3提供的五维参数空间中的分层聚类算法后，我们把恢复的团块分为两种模式：大结构和小结构，这由每个团块检测到的恒星数量定义。 在第一种模式中，我们在恒星密度较高的区域沿赤纬轴发现了13个恒星集团。 在第二种模式中，我们恢复了34个团块，分为两种类型：14个作为完全独立于较大结构的小集团，包括四个新的团块候选者，以及12个被归类为嵌入五个较大团块中的子结构。 此外，还包含了APOGEE-2和GALAH DR3的径向速度数据，以研究猎户座复合体某些区域的相空间。 从大结构模式中，我们发现了猎户座OB1协会围绕共同中心的一般膨胀，提供了该区域正在经历的动力学效应的线索。 同样，在小结构模式中，投影运动学显示了$\lambda$猎户座协会的弹道膨胀，并在OB1协会中检测到了可能的团块近距离相遇事件。 显示英文摘要

摘要： In this work, we analysed young stellar clusters with spatial and kinematic coherence in the Orion star-forming complex. For this study, we selected a sample of pre-main sequence candidates using parallaxes, proper motions and positions on the colour-magnitude diagram. After applying a hierarchical clustering algorithm in the 5D parameter space provided by Gaia DR3, we divided the recovered clusters into two regimes: Big Structures and Small Structures, defined by the number of detected stars per cluster. In the first regime, we found 13 stellar groups distributed along the declination axis in the regions where there is a high density of stars. In the second regime, we recovered 34 clusters classified into two types: 14 as small groups completely independent from the larger structures, including four candidates of new clusters, and 12 classified as sub-structures embedded within five larger clusters. Additionally, radial velocity data from APOGEE-2 and GALAH DR3 was included to study the phase space in some regions of the Orion complex. From the Big Structure regime, we found evidence of a general expansion in the Orion OB1 association over a common centre, giving a clue about the dynamical effects the region is undergoing. Likewise, in the Small Structure regime, the projected kinematics shows the ballistic expansion in the $\lambda$ Orionis association and the detection of likely events of clusters' close encounters in the OB1 association.