Emission-line spectrum of the Vela X supernova remnant

Photoelectric spectrophotometric measurements of the bright filament A in Vela X are presented. The previously reported unusually large Ha/H ratio is not confirmed. The observed spectrum deviates significantly from the spectra of H ii regions and planetary nebulae, but agrees qualitatively with the predicted spectra of shock-wave supernova modeis, in particular with the Cox model with V = 141 km 5-1 Subject headings: interstellar matter - supernova remnants