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Galactic H II Regions in the LAMOST Medium-Resolution Spectroscopic Survey of Nebulae

  • Authors: Yunning Zhao, Wei Zhang, Lin Ma, Shiming Wen, Tao Jing, Cheng Li, Zheng Zheng, Aiyuan Yang, Shichao Han, Juanjuan Ren, Jianjun Chen, Hong Wu, Yongheng Zhao

Yunning Zhao et al 2026 The Astronomical Journal 172 .

  • Provider: AAS Journals

Caption: Figure 4.

SMB diagnostic diagram. The black dashed line is the criterion to separate H II regions and PNe, whose mathematical expression is shown in the lower right corner. The gray shaded area belongs to SNRs. H II regions, PNe, and SNRs are denoted by black plus signs, red circles, and green triangles, respectively.

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