AI 中文总结
研究疏散星团中双星比例及质量比与星团性质的关系，通过773个星团样本识别双星系统并估计比例，发现金属丰度与双星比例反相关、双星在星团内部分布及质量比变化等规律，表明双星比例早期确定，不受星团动力学演化影响。
AI 中文摘要
恒星多重性在疏散星团的动力学演化以及恒星形成和演化过程中至关重要。由于大多数恒星形成于多星系统，研究环境性质如何影响其形成至关重要。我们旨在研究不同疏散星团环境中双星比例和质量比如何变化。通过773个疏散星团样本，识别双星系统并估计双星比例，整体范围为0.10 - 0.85，高质量比系统为0.06 - 0.79。未发现与年龄或演化阶段有强烈依赖关系，但发现金属丰度与双星比例呈反相关。年轻和老年星团质量比分布不同。还发现恒星作为主星的概率随恒星质量增加，质量低于1太阳质量时，恒星属于双星系统的概率随质量增加，高质量时保持在60% - 70%。与单星相比双星优先位于星团内部区域，平均质量比随距星团中心距离增加而减小。这些结果表明双星比例似乎在早期就已确定，很大程度上不受星团动力学演化影响。星团内部区域双星的聚集可能降低其动力学逃逸的敏感性。
英文摘要
Stellar multiplicity is key in dynamical evolution of open clusters (OCs) and processes of stellar formation and evolution. Since most stars form in multiple systems, investigating how environmental properties affect their occurrence is crucial. We aim to investigate how binary fraction and mass ratios change across different OC environments. Using a sample of 773 OCs, we identified binary systems and estimated binary fractions, obtaining values in the ranges 0.10-0.85 overall and 0.06-0.79 for high mass-ratio systems. No strong dependence on age or evolutionary stage is found, while an anticorrelation between metallicity and the binary fraction is identified. However, young and old clusters exhibit distinct mass-ratio distributions. We also find that the probability of a star being the primary component increases with stellar mass. In contrast, the probability of a star belonging to a binary system increases with mass for masses below 1 solar mass, and remains between 60% and 70% for high masses. Binary systems are preferentially located in the inner regions of clusters compared to single stars, and the mean mass ratio decreases with increasing distance from the cluster center. These results suggest that the binary fraction appears to be set at early times and remains largely unaffected by cluster dynamical evolution. The concentration of binaries in the inner regions of clusters likely reduces their susceptibility to dynamical escape.
Journal refThe Astrophysical Journal, Volume 1006, Article 92, 2026
