Nebula Line

Japanese: 星雲線 - せいうんせん
Nebula Line
The term "forbidden lines" refers to special emission lines that appear in the spectra of planetary nebulae, etc., caused by atoms or ions of oxygen, nitrogen, sulfur, etc. that are in an ionized state at high temperatures.

Source: The Selected Edition of the Japanese Language Dictionary About the Selected Edition of the Japanese Language Dictionary Information

Japanese:
〘名〙 惑星状星雲などのスペクトルに現われる特殊な輝線。高温で電離状態にある酸素、窒素、硫黄などの原子またはイオンによる禁制線。

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