Figure 18.
Spectra of six SNe showing the HV features in Hα (black) which have a counterpart in Hβ (red). The HV components are seen at high velocities of ∼−10 000 km s−1 and slow down with time. The presence of matching line in Hβ supports an interpretation of a hydrogen HV feature.

Spectra of six SNe showing the HV features in Hα (black) which have a counterpart in Hβ (red). The HV components are seen at high velocities of ∼−10 000 km s−1 and slow down with time. The presence of matching line in Hβ supports an interpretation of a hydrogen HV feature.

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