Fig. 29
Shielding functions for photodissociation (red curves) and photoionisation (blue curves) by a column of H2. Assumes an impinging ISRF or simulation of the TW-Hydra circumstellar radiation. A few extreme cases have their identity labelled. The shaded-region edge describes a typical ultraviolet-extinction curve due to interstellar dust, according to exp−3AV.
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