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Fig. 2

image

Influence of the adopted Doppler width on the resulting optical and near-infrared spectra for a SN II model arising from a 15 M progenitor. A weak mixing of all species is used except for 56Ni for which we adopt a strong mixing. The increase in Hα line flux with decreasing VDop is at the expense of a decrease in flux from a forest of Fe II lines in the 4000− 6000Å region. Other lines affected are He I 1.083 μm, O I 1.129 μm, Fe I lines around 1.165 μm, Mg I lines at1.183, 1.502, 1.577, 1.711, H I 1.875 μm. Note that about 70% of the total flux falls in the optical range.

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