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Fig. 8

image

Comparison of the spectral regions around Hβ (left) and Hα (right) for model DDC15 with Mst = 0.18 M (thick black curve) and Mst = 10−5 M (thin black curve; the stripped material contributes negligibly in that case). The different epochs spanning 100 to 300 d are stacked vertically. The difference between the two models gives a physical measure of the contribution from the stripped material (thick red line). For comparison, we show the H I spectrum that results if we neglect theinfluence of all other ions (thick dashed red line). It can thus be used to gauge the influence of the metal-rich ejecta on the emission from the stripped material. This influence is moderate or negligible for Hα, but very strong for Hβ. This figure shows that stripped material is not expected to yield any observable Hβ emission for hundreds of days because of metal-line blanketing from the metal-rich (SN Ia) ejecta, whereas Hα emission is prominent.

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