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Coronal Temperature as an Age Indicator
Hwankyung Sung, M. S. Bessell, Hugues Sana
The X-ray spectra of late type stars can generally be well fitted by a two temperature component model of the corona. We fnd that the temperature of both components are strong func…
The Struve-Sahade effect in the optical spectra of O-type binaries I. Main-sequence systems
N. Linder, G. Rauw, H. Sana +2
We present a spectroscopic analysis of four massive binary systems that are known or are good candidates to display the Struve-Sahade effect (defined as the apparent strengthening…
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…
Early-type stars in the core of the young open cluster Westerlund2
G. Rauw, J. Manfroid, E. Gosset +5
Aims. The properties of the early-type stars in the core of the Westerlund2 cluster are examined in order to establish a link between the cluster and the very massive Wolf-Rayet bi…
An XMM-Newton view of the young open cluster NGC 6231 -- I. The catalogue
H. Sana, E. Gosset, G. Rauw +2
This paper is the first of a series dedicated to the X-ray properties of the young open cluster NGC 6231. Our data set relies on an XMM-Newton campaign of a nominal duration of 180…
CPD-41deg7742: an unusual wind interaction
H. Sana, E. Gosset, G. Rauw +4
We summarize the results of a multiwavelength observing campaign on the massive eclipsing binary CPD-41deg7742, another remarkable object in the young open cluster NGC 6231. Our ca…