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Astronomy · L5 · Spectral Line Formation, the Curve of Growth, and Non-LTE Effects · flowchart

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by @openstemUpdated Astronomy
Continuum photons emitteddeep in photosphere (hot)Travel outward throughcooler overlying layersPhoton energy matchesan atomic transition?Escapes freely:contributes to continuumAbsorbed by atom/ion,re-emitted isotropicallyNet flux removed fromline-of-sight beamObserved as anabsorption lineNoYes

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