CoRoT observations of O stars: diverse origins of variability
  Six O-type stars were observed continuously by the CoRoT satellite during a 34.3-day run. The unprecedented quality of the data allows us to detect even low-amplitude stellar pulsations in some of these stars (HD 46202 and the binaries HD 46149 and Plaskett's star). These cover both opacity-driven modes and solar-like stochastic oscillations, both of importance to the asteroseismological modelling of O stars. Additional effects can be seen in the CoRoT light curves, such as binarity and rotational modulation. Some of the hottest O-type stars (HD 46223, HD 46150 and HD 46966) are dominated by the presence of red-noise: we speculate that this is related to a sub-surface convection zone. 
R. Blomme, M. Briquet, P. Degroote, L. Mahy, C. Aerts, J. Cuypers, M.   Godart, E. Gosset, M. Hareter, J. Montalban, T. More...
astro-ph.SR astro-ph.GA