Active ob stars: structure, evolution, mass-loss, and critical limits vol:272 pages:549-550
IAU Symposium Proceedings Series
272nd Symposium of the International-Astronomical-Union on Active OB Stars: Structure, Evolution, Mass-Loss, and Critical Limits Paris, FRANCE, JUL 19-23, 2010
As part of a long term observational project, we are investigating the macroturbulent broadening in O and B supergiants (Sgs) and its possible connection with spectroscopic variability phenomena and stellar oscillations. We present the first results of our project, namely firm observational evidence for a strong correlation between the extra broadening and photospheric line-profile variations in a sample of 13 Sgs with spectral types ranging from O9.5 to B8.