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Towards an understanding of the Of?p star HD 191612: optical spectroscopy
Ian D. Howarth, Nolan R. Walborn, Danny J. Lennon +17
We present extensive optical spectroscopy of the early-type magnetic star HD 191612 (O6.5f?pe-O8fp). The Balmer and HeI lines show strongly variable emission which is highly reprod…
The massive star binary fraction in young open clusters I. NGC 6231 revisited
H. Sana, E. Gosset, Y. Naze +2
We present the results of a long-term high-resolution spectroscopy campaign on the O-type stars in NGC 6231. We revise the spectral classification and multiplicity of these objects…
First detection of phase-dependent colliding wind X-ray emission outside the Milky Way
Yael Naze, Michael F. Corcoran, Gloria Koenisgberger +1
After having reported the detection of X-rays emitted by the peculiar system HD5980, we assess here the origin of this high-energy emission from additional X-ray observations obtai…