Abstract
a) Ha displays an approximately stationary broad emission. b) The emission of Hen A, 4686 changes in profile throughout the cycle, becoming diffuse or double at about secondary minimum (when the Of component is in front) and definitely double before primary minimum (the doubling was observed on plates taken at phases near 0?8). In the latter case, the extra component is weak and appears to the violet of the regular emission. c) The radial velocities from the emission lines of He n and N in suggest a velocity curve similar to that from the absorption lines but systematically shifted to more positive values, except near quadrature after primary minimum, when the velocities are more negative than those from the absorption lines. d) The velocities from the absorption core of Ha are, in the first half and the last quarter of the cycle, systematically more negative than those from the absorption lines ; in the rest of the cycle, the velocities are practically coincident with the y-velocity.
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