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Fig. 7

image

Evolution of the photospheric velocity from 30 to 90 d after explosion in model DDC15. The two vertical lines give the location of Hα and Hβ. This computation includes the effects of all opacity sources and is thus more relevant than the Rosseland-mean (because not very physical at low optical depth) or the electron-scattering (because it strongly underestimates the true opacity) optical depth shown in Fig. 6. This figure shows that Hβ sits in a region of strong blanketing (since photons essentially decouple at 9000− 12 000 km s−1 at the times depicted) while Hα sits in one of the most transparent regions of the optical range.

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