On the velocity dispersion of young star clusters: super-virial or binaries? (2009)
Gieles, M., Sana, H., Zwart, S. F. Portegies
Many young extra-galactic clusters have a measured velocity dispersion that is too high for the mass derived from their age and total luminosity, which has led to the suggestion that they are not in...
The VLT-FLAMES Tarantula Survey (2009)
Evans, C. J., Bastian, N., Beletsky, Y., Brott, I., Cantiello, M., Clark, J. S., ...
The Tarantula Survey is an ambitious ESO Large Programme that has obtained multi-epoch spectroscopy of over 1,000 massive stars in the 30 Doradus region of the Large Magellanic Cloud. Here we...
The massive star binary fraction in young open clusters - II. NGC 6611 (Eagle Nebula) (2009)
Sana, H., Gosset, E., Evans, C. J.
Based on a set of over 100 medium- to high-resolution optical spectra collected from 2003 to 2009, we investigate the properties of the O-type star population in NGC6611 in the core of the Eagle...
Rauw, Grégor, Naze, Yaël, Fernández Lajús, E, Lanotte, Audrey, Solivella, G R, Sana, H, ...
We present the results of a spectroscopic monitoring campaign devoted to three O-type stars in the Carina nebula. We derive the full SB2 orbital solution of the binary system Tr16-112, an exceptional...
Elemental abundances in the Galactic bulge from microlensed dwarf stars (2009)
Bensby, T., Feltzing, S., Johnson, J. A., Gould, A., Sana, H., Gal-Yam, A., ...
We present elemental abundances of 13 microlensed dwarf and subgiant stars in the Galactic bulge, which constitute the largest sample to date. We show that these stars span the full range of...
Mahy, Laurent, Naze, Yaël, Rauw, Grégor, Gosset, Eric, De Becker, Michaël, Sana, H, ...
Aims. We present the results obtained from a long-term spectroscopic campaign to study the multiplicity of O-type stars in both the young open cluster NGC 2244 and the Mon OB2 association. Methods:...
Gosset, Eric, Sana, H, Linder, N, Rauw, Grégor
Already suspected to be variable, the O9Ib((f)) supergiant HD 152249 has been the subject of a dedicated follow-up spectroscopic run. We report here on the preliminary results. This star is...
The place of interferometry in massive star multiplicity sudies (2009)
While it is well known that most massive stars are found to be part of binary or multiple systems, an accurate characterization of the statistical properties of these multiple objects is still...
Rauw, G., Nazé, Y., Lajús, E. Fernández, Lanotte, A., Solivella, G. R., Sana, H., ...
We present the results of a spectroscopic monitoring campaign devoted to three O-type stars in the Carina nebula. We derive the full SB2 orbital solution of the binary system Tr 16-112, an...
Mahy, L., Naze, Y., Rauw, G., Gosset, E., De Becker, M., Sana, H., ...
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 NGC2244 and in the Mon OB2 association. Methods....
The nature of the line profile variability in the spectrum of the massive binary HD 152219 (2009)
HD 152219 is a massive binary system with O9.5 III + B1-2 V/III components and a short orbital period of 4.2 d. Its primary component further displays clear line profile variability (LPV). The...
De Becker, M., Blomme, R., Micela, G., Pittard, J. M., Rauw, G., Romero, G. E., ...
Several colliding-wind massive binaries are known to be non-thermal emitters in the radio domain. This constitutes strong evidence for the fact that an efficient particle acceleration process is at...
The first orbital solution for the massive colliding-wind binary HD 93162 (= WR 25) (2008)
Gamen, R, Gosset, Eric, Morrell, N I, Niemela, V S, Sana, H, Naze, Yaël, ...
Since the discovery, with EINSTEIN, of strong X-ray emission associated with HD 93162, this object was recurrently predicted by some authors to be a colliding-wind binary system. However,...
The investigation of particle acceleration in colliding-wind massive binaries with SIMBOL-X. (2008)
De Becker, Michaël, Rauw, Grégor, Pittard, J M, Blomme, R, Romero, G E, Sana, H, ...
An increasing number of early-type (O and Wolf-Rayet) colliding wind binaries (CWBs) is known to accelerate particles up to relativistic energies. In this context, non-thermal emission processes such...
An XMM-Newton view of the young open cluster NGC 6231-III. Optically faint X-ray sources (2007)
Sana, H, Rauw, Grégor, Sung, H, Gosset, Eric, Vreux, Jean-Marie
We discuss the properties of the X-ray sources with faint optical counterparts in the very young open cluster NGC 6231. From their positions in the Hertzsprung-Russell diagram, we find that the bulk...
Constraining the fundamental parameters of the O-type binary CPD-41 7733 (2007)
Sana, H, Rauw, Grégor, Gosset, Eric
Using a set of high-resolution spectra, we studied the physical and orbital properties of the O-type binary CPD -41 7733, located in the core of NGC 6231. We report the unambiguous detection of a...
NGC6231: X-ray Properties of the Early-Type Star Population (2007)
Sana, H, Naze, Yaël, Gosset, Eric, Rauw, Grégor, Sung, H, Vreux, J-M
Based on a deep XMM-Newton observation of the young open cluster NGC6231, we derive the main X-ray properties of its early-type star population. Among the 610 X-ray sources detected in the field, 42...
The OB binary HD 152219: a detached, double-lined, eclipsing system (2006)
Sana, H, Gosset, Eric, Rauw, Grégor
We present the results of an optical spectroscopic campaign on the massive binary HD 152219 located near the core of the NGC 6231 cluster. Though the primary to secondary optical brightness ratio is...
An XMM-Newton view of the young open cluster NGC 6231 - I. The catalogue (2006)
Sana, H, Gosset, Eric, Rauw, Grégor, Sung, H, Vreux, Jean-Marie
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 ks and reveals...
An Exceptional X-ray View of the Young Open Cluster NGC 6231: What XMM-Newton Has Taught Us (2006)
Sana, H, Gosset, Eric, Rauw, Grégor, Vreux, J-M
Considered as the core of the Sco OB1 association, the young open cluster NGC 6231 harbours a rich O-type star population. In 2001, the XMM-Newton satellite targeted the cluster for a nominal...
The young open cluster NGC 6231: five years of investigations (2005)
Sana, H, Rauw, Grégor, Gosset, Eric
In this contribution, we present an overview of the main results obtained by the Liège multiwavelength (in the X-ray and optical domains) campaign on the young open cluster NGC 6231. We probe the...
CPD-41° 7742: an unusual wind interaction (2005)
Sana, H, Gosset, Eric, Rauw, Grégor, Antokhina, E, Royer, P, Manfroid, Jean, ...
We summarize the results of a multiwavelength observing campaign on the massive eclipsing binary CPD-41° 7742, another remarkable object in the young open cluster NGC 6231. Our campaign relies on...
Gosset, Eric, Rauw, Grégor, Manfroid, Jean, Antokhina, E, Stevens, I R, Sana, H
We present preliminary results of an observational campaign aiming at the study of the binary system LSS3074. A new lightcurve clearly indicates that the system is in contact. Recent spectroscopy...
On the multiplicity of the non-thermal radio emitters 9 Sgr and HD 168112 (2005)
Rauw, Grégor, Sana, H, Gosset, Eric, De Becker, Michaël, Arias, J, Morrell, N, ...
JENAM 2005, "Distant Worlds"
The massive binary CPD-41 degrees 7742 - II. Optical light curve and X-ray observations (2005)
Sana, H, Antokhina, E, Royer, Pierre; U0037634, Manfroid, J, Gosset, E, Rauw, G, ...
In the first paper of this series, we presented a detailed high-resolution spectroscopic study of CPD - 41 degrees 7742, deriving for the first time an orbital solution for both components of the...
The massive binary CPD-41 degrees 7742 - II. Optical light curve and X-ray observations (2005)
Sana, H, Antokhina, E, Royer, P, Manfroid, Jean, Gosset, Eric, Rauw, Grégor, ...
In the first paper of this series, we presented a detailed high-resolution spectroscopic study of CPD - 41 degrees 7742, deriving for the first time an orbital solution for both components of the...
Naze, Yaël, Antokhin, II, Sana, H, Gosset, Eric, Rauw, Grégor
We present the analysis of an extensive set of high-resolution spectroscopic observations of HD 93161, a visual binary with a separation of 2 arcsec. HD 93161 A is a spectroscopic binary, with both...
Rauw, Grégor, Crowther, PA, De Becker, Michaël, Gosset, Eric, Naze, Yaël, Sana, H, ...
We analyse the optical spectrum of the very massive binary system WR20a (WN6ha + WN6ha). The most prominent emission lines, Halpha and He II lambda4686, display strong phase-locked profile...
Gosset, Eric, Naze, Yaël, Rauw, Grégor, Vreux, Jean-Marie, Sana, H.
We present the results of an XMM-Newton observation of the field of the Wolf-Rayet star WR 40. Despite a nominal exposure of 20 ks and the high sensitivity of the satellite, the star itself is not...
A phase-resolved XMM-Newton campaign on the colliding-wind binary HD 152248 (2004)
Sana, H, Stevens, IR, Gosset, Eric, Rauw, Grégor, Vreux, Jean-Marie
We report the first results of an XMM-Newton monitoring campaign of the open cluster NGC 6231 in the Sco OB 1 association. This first paper focuses on the massive colliding-wind binary HD 152248,...
The massive binary CPD-41 degrees 7742 - I. High-resolution optical spectroscopy (2003)
Sana, H, Hensberge, H, Rauw, Grégor, Gosset, Eric
We present the results of a spectroscopic campaign on the early-type binary CPD-41degrees 7742. For the first time, we unambiguously detect the secondary's spectral signature and derive an accurate...
Albacete Colombo, J.F., Morrell, NI, Rauw, Grégor, Corcoran, MF, Niemela, VS, Sana, H
High-resolution optical spectroscopy of CPD -59degrees2636, one of the O-type stars in the open cluster Trumpler 16 in the Carina Nebula, reveals this object to be a multiple system displaying triple...
A multi-wavelength investigation of the non-thermal radio emitting O-star 9 Sgr (2002)
Rauw, Grégor, Blomme, R, Waldron, WL, Corcoran, MF, Pittard, JM, Pollock, AMT, ...
We report the results of a multi-wavelength investigation of the O4 V star 9 Sgr (= HD164794). Our data include observations in the X-ray domain with XMM-Newton, in the radio domain with the VLA as...
Phase-resolved X-ray and optical spectroscopy of the massive binary HD93403 (2002)
Rauw, Grégor, Vreux, Jean-Marie, Stevens, IR, Gosset, Eric, Sana, H, Jamar, Claude, ...
We report the first results of a campaign aimed at the study of early-type binaries with the XMM-Newton observatory. Phase-resolved EPIC spectroscopy of the eccentric binary HD93403 reveals a clear...
Searching for Colliding-Wind Signatures in a Sample of O-Star Binaries (2002)
Rauw, Grégor, Sana, H, Vreux, J-M, Gosset, Eric, Stevens, I R
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Optical Spectroscopy of Colliding-Wind Systems to be Observed with XMM (2002)
Sana, H, Rauw, Grégor, Gosset, Eric, Vreux, J-M
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Rauw, Grégor, Sana, H, Antokhin, I I, Morrell, N I, Niemela, V S, Albacete Colombo, J F, ...
We discuss the orbital elements of the multiple system Tr 16-104 which is usually believed to be a member of the open cluster Trumpler 16 in the Carina complex. We show that Tr 16-104 could be a...
HD 152248: Evidence for a colliding wind interaction (2001)
Sana, H, Rauw, Grégor, Gosset, Eric
We present the results of a four year spectroscopic campaign on the early-type binary system HD 152248. Our analysis yields a new classification as O7.5III(f) + O7III(f), in contradiction with...
A new orbital solution for the massive binary system HD 93403 (2000)
Rauw, Grégor, Sana, H, Gosset, Eric, Vreux, J-M, Jehin, Emmanuel, Parmentier, Geneviève
We present a spectroscopic analysis of the early-type massive binary system HD 93403. Using high resolution optical spectra, we clearly separate the primary and secondary components. For the first...