发表机构
Istanbul Galata University; Fatih Sultan Mehmet Vakif University; Institute of Graduate Studies in Science, Istanbul University（伊斯坦布尔加拉塔大学; 法提赫苏丹穆罕默德瓦基夫大学; 伊斯坦布尔大学科学研究生院）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用 Gaia DR3 数据，通过 UPMASK 和贝叶斯嵌套采样等时线拟合，系统表征了 14 个未充分研究的疏散星团，统一推导其年龄、距离、红化和金属丰度，为银盘普查提供高保真基线。
AI 中文摘要
疏散星团是研究银盘化学和动力学演化的基本示踪体。本研究对 Pismis 星表中 14 个未充分研究的疏散星团进行了系统表征，这些星团在 Gaia DR3 中具有清晰的恒星序列，并覆盖了广泛的年龄和距离范围。利用高精度 Gaia DR3 天体测量数据，我们为这些历史发现提供了高保真的现代化更新，同时在不同恒星种群中检验了我们的分析框架。成员概率通过无监督 UPMASK 算法，使用 Gaia DR3 的位置、自行和视差来确定。为确保样本高纯度，进入等时线拟合的成员样本限制为 P >= 0.90，天体物理参数通过成员加权似然计算。基本性质——年龄、距离、红化和金属丰度——采用贝叶斯嵌套采样方法进行等时线拟合得出，该方法因其对密集银道面区域典型参数简并性的稳健性而被选用。这 14 个系统表现出广泛的性质范围，年龄约为 11 Myr 至 1.5 Gyr，距离约为 690 至 5445 pc。这些精细化的统一参数将历史观测与现代天体物理学的精度时代相协调，为大规模自动巡天仅部分恢复的系统提供了均匀的基线。与广泛使用的自动星表的直接交叉匹配显示，这些星表通常仅包含我们识别出的成员的大约三分之一，在最拥挤的星场中则更少，这凸显了专门分析的必要性。这项工作有助于更完整地普查银盘，并为许多尚未表征的可比低纬度系统提供了一套可复现、逐星团适用的方法。
英文摘要
Open clusters are fundamental tracers of the chemical and dynamical evolution of the Galactic disc. This study presents a systematic characterisation of 14 understudied open clusters from the Pismis catalogue, selected for a well-defined stellar sequence in Gaia DR3 and spanning a wide range of ages and distances. Using high-precision Gaia DR3 astrometry, we provide a high-fidelity modernisation of these historical discoveries while testing our analytical framework across diverse stellar populations. Membership probabilities were determined via the unsupervised UPMASK algorithm using Gaia DR3 positions, proper motions, and parallaxes. To ensure high sample purity, the member samples entering the isochrone fits were restricted to P >= 0.90, with astrophysical parameters calculated through membership-weighted likelihoods. Fundamental properties -- age, distance, reddening, and metallicity -- were derived using a Bayesian Nested Sampling approach to isochrone fitting, chosen for its robustness against the parameter degeneracies typical of dense Galactic fields. The 14 systems exhibit a broad range of properties, with ages from approximately 11 Myr to 1.5 Gyr and distances spanning approximately 690 to 5445 pc. These refined, uniform parameters reconcile historical observations with the precision era of modern astrophysics, providing a homogeneous baseline for systems that large-scale automated surveys recover only partially. A direct cross-match against widely used automated catalogues shows that they typically contain only about a third of the members identified here, and substantially less in the most crowded fields, underscoriecific analysis. This workcontributes to a more complete census of the Galactic disc and sets out a reproducible, per-cluster licable to the manycomparable low-latitude systems still to be characterised.
Comments29 pages, 6 figures. Accepted for publication in PASP. Abstract abbreviated to meet arXiv's character limit
