The complex, variable structure of stationary lines in SS433

On 1979 June 3–6, a number of spectra of SS433 were obtained using the UCL Image Photon Counting System on the 3.6-m telescope of the European Southern Observatory, La Silla, Chile. The stationary Hα and He Iλλ 5875, 6678 and 7065 lines have a complex structure which on June 4–5 exhibited a central feature accompanied by two equally displaced $$\pm 1000 \,\text{km}\,\text{s}^{-1}$$ side components. Variability of the line profile and equivalent width is observed on time-scales as short as a quarter of an hour.