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- The multiplicity of O-type stars in NGC2244
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The multiplicity of O-type stars in NGC2244
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Abstract
The investigation of the multiplicity of massive stars is crucial to determine a robust binary fraction but also for understanding the physical properties of these objects. In this contribution, we will present the main results from our long-term spectroscopic survey devoted to the young open cluster NGC2244. We discuss the spectral classification, the projected rotational velocity (v sin i) and the multiplicity of O-stars. The stellar and wind parameters of each star, obtained using the CMFGEN atmosphere code, help us to better constrain the individual properties of these objects. Several of these stars were observed by the CoRoT satellite (SRa02) in the Asteroseismology channel. This intensive monitoring and the unprecedented quality of the light curves allow us to shed a new light on these objects.
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About: L. Mahy
Institute of Astrophysics and Geophysics, University of Liège, Belgium
About: G. Rauw
Institute of Astrophysics and Geophysics, University of Liège, Belgium
About: F. Martins
GRAAL, Université Montpellier II, CNRS, France
About: E. Gosset
Institute of Astrophysics and Geophysics, University of Liège, Belgium
About: Y. Nazé
Institute of Astrophysics and Geophysics, University of Liège, Belgium
About: M. Godart
Institute of Astrophysics and Geophysics, University of Liège, Belgium
About: H.Sana
Sterrenkundig Instituut “Anton Pannekoek”, Universiteit van Amsterdam, The Netherlands
About: M. De Becker
Institute of Astrophysics and Geophysics, University of Liège, Belgium
About: P. Eenens
Departamento de Astronomía, Universidad de Guanajuato, Mexico