Early-type stars in the young open cluster NGC 2244 and in the Monoceros OB2 association. I. The mul

@article{Mahy2009EarlytypeSI,
  title={Early-type stars in the young open cluster NGC 2244 and in the Monoceros OB2 association. I. The mul},
  author={L. Mahy and Y. Naz{\'e} and G. Rauw and E. Gosset and M. D. Becker and H. Sana and P. Eenens},
  journal={Astronomy and Astrophysics},
  year={2009}
}
Aims. We present the results obtained from a long-term spectroscopic campaign devoted to the multiplicity of O-type stars in the young open cluster NGC 2244 and in the Mon OB2 association. Methods. Our spectroscopic monitoring was performed over several years, allowing us to probe different time-scales. For each star, several spectral diagnostic tools are applied, in order to s earch for line shifts and profile variations. We also measure the projected rotational velocity and revisit the… Expand
A spectroscopic investigation of early-type stars in the young open cluster Westerlund 2
Context. The distance of the very young open cluster Westerlund 2, which contains the very massive binary system WR 20a and is likely associated with a TeV source, has been the subject of muchExpand
A spectroscopic investigation of the O-type star population in four Cygnus OB associations I. Determination of the binary fraction
Context. Establishing the multiplicity of O-type stars is the first st ep towards accurately determining their stellar parameters. Moreover, the distribution of the orbital parameters provi desExpand
A quantitative study of O stars in NGC 2244 and the Monoceros OB2 association
Aims. Our goal is to determine the stellar and wind properties of seven O stars in the cluster NGC 2244 and three O stars in the OB association Mon OB2. These properties give us insight into the massExpand
A NEW INVESTIGATION OF THE BINARY HD 48099
With an orbital period of about 3.078 days, the double-lined spectroscopic binary HD 48099 is, until now, the only short-period O+O system known in the Mon OB2 association. Even though an orbitalExpand
Massive binaries in the vicinity of Sgr A
A long-term spectroscopic and photometric survey of the most luminous and massive stars in the vicinity of the supermassive black hole Sgr A* revealed two new binaries: a long-period Ofpe/WN9 binary,Expand
A quantitative study of the O stars in NGC 2244
NGC 2244 located in the Rosette Nebula is a young open cluster composed of seven O-type stars. A first paper focused on the multiplicity of these stars, revealed only one binary system out of theExpand
Variability in the CoRoT photometry of three hot O-type stars HD 46223, HD 46150, and HD 46966
Context. The detection of pulsational frequencies in stellar photometry is required as input for asteroseismological modelling. The second short run (SRa02) of the CoRoT mission has providedExpand
The young massive SMC cluster NGC 330 seen by MUSE
A majority of massive stars are part of binary systems, a large fraction of which will inevitably interact during their lives. Binary-interaction products (BiPs), i.e. stars affected by suchExpand
Further results from the galactic O-Star Spectroscopic Survey: rapidly rotating late ON giants
With new data from the Galactic O-Star Spectroscopic Survey, we confirm and expand the ONn category of late-O, nitrogen-enriched (N), rapidly rotating (n) giants. In particular, we have discoveredExpand
The multiplicity of massive stars
  • H. Sana, C. Evans
  • Physics
  • Proceedings of the International Astronomical Union
  • 2010
Abstract Binaries are excellent astrophysical laboratories that provide us with direct measurements of fundamental stellar parameters. Compared to single isolated stars, multiplicity induces newExpand
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