Title:
Evidence for rapid variability in the multiple system 68 u Her

Pavel Koubsky in cooperation with
P. Harmanec, M.T. Richards, J.H. Telting and K. Uytterhoeven

Text:
The best orbital solution of 68 u Her, an early-type semi-detached binary
system was presented some twenty years ago. During the attempt to derive
better elements based on electronic spectra from NOT, KPNO (coude
feed), Ondvrejov 2 m telescope, DAO Victoria (1.83 and 1,2 m
telescopes) and the 2.13 m telescope at Xing Long we found clear evidence
for rapid variability in the profiles of the lines from the primary
component. Results seen in the changing shape and RV of lines will be
discussed.