CoRoT observations of O stars: diverse origins of variability

Details CoRoT observations of O stars: diverse origins of variability CoRoT observations of O stars: diverse origins of variability

2011-09-09

arxiv.org/abs/1109.1999v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

5 pages, 3 figures, conference paper. To be published in "Four decades of Research on Massive Stars", Astronomical Society of

Scientific paper

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.

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