Title: Revisiting open clusters within 200 pc in the solar neighbourhood with Gaia DR3 Show Chinese title

Title: 重新审视太阳邻域内200 pc以内的开放星团与盖亚DR3

Abstract: In this study, we develop a membership identification method and apply it for 30 open clusters (OCs) within 200 pc of the Sun using astrometric data of Gaia DR3. By accounting for projection effects that distort apparent stellar motions, our approach converts astrometric data into accurate five-dimensional positions and velocities. This approach enables better identification of members in nearby open clusters. We then compare our refined membership lists with previous catalogs, revealing more members in most open clusters, but also the identification of elongated structures in Melotte 25 (Hyades), NGC 2632 (Praesepe), Melotte 111 (Coma Berenices), Platais 3, Melotte 22 (Pleiades), NGC 2451A, Platais 9, IC 2391, Platais 8, UPK 640, HSC 2986, which we studied in detail. An analysis of the ages of their members reveals the members within and outside of the tidal radius are distinctly coeval, further validating our methodology. This study suggests that for OCs in the solar neighborhood, correcting for the projection effect is very important for identification of OC members. Show Chinese abstract

Abstract: 在本研究中，我们开发了一种成员识别方法，并利用盖亚DR3的天体测量数据将其应用于太阳周围200秒差距内的30个疏散星团（OCs）。通过考虑扭曲恒星表观运动的投影效应，我们的方法将天体测量数据转换为准确的五维位置和速度。这种方法能够更好地识别附近疏散星团中的成员。然后我们将改进后的成员列表与之前的星表进行比较，发现在大多数疏散星团中发现了更多成员，但也识别出了Melotte 25（Hyades）、NGC 2632（Praesepe）、Melotte 111（Coma Berenices）、Platais 3、Melotte 22（Pleiades）、NGC 2451A、Platais 9、IC 2391、Platais 8、UPK 640、HSC 2986中的延伸结构，我们对这些进行了详细研究。对其成员年龄的分析表明，潮汐半径内外的成员在年龄上明显一致，进一步验证了我们的方法。本研究表明，对于太阳附近的OCs，校正投影效应对于识别OC成员非常重要。