银河疏散星团的 differential 红化与消光规律分析
Differential Reddening and Extinction Law Analyses of Galactic Open Clusters
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中文总结 AI 辅助
本研究利用盖亚数据对疏散星团的红化与消光规律进行均质表征，发现differential红化随平均红化增加，红化校正可收窄多数星团的CMD序列，CER分布差异或源于尘埃环境不同。
中文摘要 AI 辅助
消光显著影响疏散星团的参数及其在银河结构研究中的应用，但针对疏散星团消光特性的大样本均质测量仍较为有限。利用盖亚（Gaia）时代的疏散星团成员样本，结合多波段测光与恒星参数，我们推导了成员星的色余，并对星团尺度的平均红化、 differential 红化及色余比（CER）进行了均质表征。differential 红化随平均红化呈系统性增加，银道面附近高红化星团表现出更强的消光变化。针对单颗恒星的红化校正，使435个拥有可靠色-星等图（CMD）宽度测量的星团中，369个（占85%）的CMD序列收窄，且星团色余图揭示了小尺度消光结构。中值CER与标准 diffuse 星际介质消光曲线相符，而广泛的CER分布及其在银盘上的大尺度变化，可能反映了不同银视线方向所采样的主导尘埃环境的差异。
英文摘要
Extinction significantly affects open cluster parameters and their use in studies of Galactic structure, yet homogeneous large sample measurements of open cluster extinction properties remain limited. Using Gaia-era open cluster member samples combined with multi-band photometry and stellar parameters, we derive color excesses of member stars and provide the homogeneous characterization of the mean reddening, differential reddening, and color excess ratio (CER) at the cluster scale. Differential reddening increases systematically with mean reddening, with highly reddened clusters near the Galactic plane showing stronger extinction variations. Star-by-star reddening corrections narrow color--magnitude diagram (CMD) sequences in 369 of 435 clusters (85%) with reliable CMD-width measurements, and cluster color excess maps reveal small-scale extinction structures. The median CER is compatible with the standard diffuse interstellar medium extinction curve, while the broad CER distribution and its large-scale variations across the Galactic disk likely reflect differences in the dominant dust environments sampled along different Galactic sight lines.
