AI 中文总结
研究球状星团多星族现象，通过确定跨星团ChM框架校正不同金属丰度影响，定义新指数\(S_{\rm ChM,z}\)，发现其与多种星团参数相关，揭示双质子化学多样性受内部富集和环境影响。
AI 中文摘要
染色体图（ChMs）是用于诊断球状星团中多星族现象的二维紫外/光学假彩色图。其原始形态受测光滤光片金属丰度依赖响应影响，阻碍不同金属丰度星团间的无偏比较。我们确定了一个跨星团ChM框架来解决此依赖性，对23个银河系球状星团的ChMs进行分析并校正不同金属丰度影响。定义新的测光富集指数\(S_{\rm ChM,z}\)，并与星团质量、结构参数等比较。\(S_{\rm ChM,z}\)与富集星族的多元化学丰度范围及铝扩散相关，依赖星团势阱深度和轨道限制，表明双质子化学多样性受内部富集物理和环境印记共同影响。
英文摘要
Chromosome maps (ChMs) are two-dimensional diagrams of UV/optical pseudocolours widely used to diagnose the multiple stellar populations (MPs) phenomenon in globular clusters. Their raw morphology is affected by the metallicity-dependent response of the photometric filters, preventing unbiased comparisons across clusters of different metallicities. We identify a cross-cluster ChM framework that accounts for this dependence, enabling an unbiased investigation of the physical drivers of MP diversity. We analyse ChMs for 23 Galactic globulars and devise a technique to correct the raw maps for the clusters' different metallicities. On the resulting "universal" ChM we define a new photometric enrichment index $S_{\rm ChM,z}$, validated against APOGEE spectroscopy. We compare this index with cluster masses, structural parameters, orbital quantities, and accretion-origin classifications. $S_{\rm ChM,z}$ correlates with the multivariate chemical abundance ranges of the enriched population and with the aluminium spread. Across the sample it increases with initial mass but correlates most strongly with a family of orbital-confinement quantities ($z_{\max}$, vertical action, apocentre, Galactocentric radius, orbital energy). The corrected ChMs provide a chemically meaningful, population-level measure of the enriched sequence. $S_{\rm ChM,z}$ does not trace a single abundance ratio but captures the cluster-to-cluster amplitude of the combined light-element variations, with particular sensitivity to the high-temperature Mg-Al/O component of proton-capture processing. Its dependence on both cluster potential depth and orbital confinement suggests that 2P chemical diversity is shaped by internal enrichment physics together with an environmental imprint, whether inherited at formation, modified by early evolution, or filtered by subsequent orbital survival.
Comments16 pages, 9 figures, accepted for publication in A&A. This abstract has been shortened to comply with the arXiv character limit; the full abstract can be found in the published article
