H II pink

LITIn true-colour images, the H II regions dotting spiral-galaxy arms often look pink rather than pure red. The red Hα line (656.28 nm) is joined by Hβ (486.13 nm) and fainter Balmer lines in the blue-violet, and that red-plus-blue mix lands off the spectral locus as pink-magenta. Many published Hubble images are also processed composites, so their pinks are partly a choice.

COMPUTEDHα and Hβ wavelengths come from the Rydberg formula (as in batch 17), mixed at the Hα/Hβ ratio on the slider. The Case B value of ≈2.86 is a textbook figure I have not verified. Dust reddening raises the ratio. Hγ (434.05 nm) is added at 0.47× Hβ (also unverified Case B). Nesting: the blue star cluster core, the pink nebula, void.

Hα/Hβ Hγ: on

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