Spectrographic observations of beta Lyr during the international campaign of 1971.

The results of the spectrographic observations of Lyr during the international campaign of July-August 1971 are given, i.e. radial velocity, profile and intensity variation of several significant lines. An asymmetrical distribution of matter in the envelope surrounding the whole system and having higher density in front of the preceding hemisphere of the B9 star is indicated by our observations. Mass exchange is suggested by the broad and shallow RV minimum presented by the H I and He I shell absorption cores at phases 0.92 to 0.15, which can be explained by a broad jet of matter moving from the B9 star to the companion through the first Lagrangian point. Mass loss is suggested by the increase in the approaching RV observed at phase 0.46, which can be explained by matter flowing through the second Lagrangian point, and by the presence of an extended envelope expanding at constant velocity of about -100 kms-1, where the circumstellar lines of Na I and Ca II are formed. The satellite lines are much less evident in 1971 than in 1958. None of the various absorption or emission features shows any correlation with the invisible companion. Key words: Lyr spectrum - radial velocity line intensity - contour variation