A multiwavelength investigation of the massive eclipsing binary Cyg OB2 #5 (2009)
Linder, Natacha, Rauw, Grégor, Manfroid, Jean, Damerdji, Yassine, De Becker, Michaël, Eenens, P, ...
Context. The properties of the early-type binary Cyg OB2 #5 have been debated for many years and spectroscopic and photometric investigations yielded conflicting results. Aims. We have attempted to...
XMM-Newton X-ray study of early type stars in the Carina OB1 association (2008)
Antokhin, I.I., Rauw, Grégor, Vreux, Jean-Marie, Van Der Hucht, K.A., Brown, J.C.
Aims. X-ray properties of the stellar population in the Carina OB I association are examined with special emphasis on early-type stars. Their spectral characteristics provide some clues to...
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...
Long-term Spectroscopic Variability of Two Oe Stars (2007)
Rauw, Grégor, Naze, Yaël, Marique, PX, De Becker, Michaël, Sana, Hugues, Vreux, Jean-Marie
HD 45314 and HD 60848 are poorly studied Oe-type stars. Spectroscopic monitoring over 5 years reveals strong variations in the strength of the emission lines and for HD 45314 in the V/R ratio of the...
An XMM-Newton view of the young open cluster NGC 6231 - II. The OB star population (2006)
Sana, H, Rauw, Grégor, Naze, Yaël, Gosset, Eric, Vreux, Jean-Marie
In this second paper of the series, we pursue the analysis of the 180-ks XMM-Newton campaign towards the young open cluster NGC 6231 and we focus on its rich OB star population. We present a...
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...
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...
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...
WR 20a: A massive cornerstone binary system comprising two extreme early-type stars (2004)
Rauw, Grégor, De Becker, Michaël, Naze, Yaël, Crowther, PA, Gosset, Eric, Sana, H, ...
We analyse spectroscopic observations of WR20a revealing that this star is a massive early-type binary system with a most probable orbital period of similar to3.675 days. Our spectra indicate that...
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,...
XMM-Newton observations of the giant H II region N 11 in the LMC (2004)
Naze, Yaël, Antokhin, II, Rauw, Grégor, Chu, YH, Gosset, Eric, Vreux, Jean-Marie
Using the sensitive XMM-Newton observatory, we have observed the giant H II region N11 in the LMC for similar to30 ks. We have detected several large areas of soft diffuse X-ray emission along with...
HD 108: The mystery deepens with XMM-Newton observations (2004)
Naze, Yaël, Rauw, Grégor, Vreux, Jean-Marie, De Becker, Michaël
In 2001, using a large spectroscopic dataset from an extensive monitoring campaign, we discovered that the peculiar Of star HD 108 displayed extreme line variations. This strange behaviour could be...
WR bubbles and HeII emission (2003)
Naze, Yaël, Rauw, Grégor, Manfroid, Jean, Chu, YH, Vreux, Jean-Marie
We present the very first high quality images of the He II lambda4686 emission in three high excitation nebulae of the Magellanic Clouds. A fourth high excitation nebula, situated around the WR star...
Raassen, AJJ, Van Der Hucht, KA, Mewe, R, Antokhin, I, Rauw, Grégor, Vreux, Jean-Marie, ...
We report the analysis of the first high-resolution X-ray spectra of the Wolf-Rayet (WR) object WR25 (HD 93162, WN6ha+O4f) obtained with the reflection Grating spectrometers (RGS) and the European...
VLT observations of the highly ionized nebula around Brey2 (2003)
Naze, Yaël, Rauw, Grégor, Manfroid, Jean, Chu, YH, Vreux, Jean-Marie
We present the first high resolution He II lambda4686 images of the high excitation nebula around the WR star Brey2 in the LMC. This nebula presents a striking morphology: a small arc-like feature...
Line profile variability in the spectra of Oef stars. I. BD + 60deg 2522 (2003)
Rauw, Grégor, De Becker, Michaël, Vreux, Jean-Marie
We report the analysis of a long term observing campaign designed to monitor the spectroscopic variability of the Oef star BD +60deg 2522. We find that the double-peaked He {II} lambda 4686 emission...
Royer, Pierre, Lundström, Ingemar, Vreux, Jean-Marie
NGC 595 is, after NGC 604, the second most luminous HII region in theMilky Ways neighbouring spiral galaxy M 33. Its Wolf-Rayet starcontent has mainly been unveiled by two different channels. On the...
XMM-Newton high-resolution X-ray spectroscopy of the Wolf-Rayet object WR25 (WN6ha+O4f) (2003)
Raassen, AJJ, Van Der Hucht, KA, Mewe, R, Antokhin, I, Rauw, Grégor, Vreux, Jean-Marie, ...
We report the analysis of the X-ray spectrum of the Wolf-Rayet star WR 25, observed by RGS and EPIC-MOS on board XMM-Newton. Temperatures up to 40 MK have been determined. Strong absorption,...
Gosset, Eric, Rauw, Grégor, Vreux, Jean-Marie, Naze, Yaël, Antokhin, Igor I, Sana, Hugues
A Massive Star Odyssey: From Main Sequence to Supernova, IAU S212
The evolved early-type binary HDE 228766 revisited (2002)
Rauw, Grégor, Crowther, PA, Eenens, PRJ, Manfroid, Jean, Vreux, Jean-Marie
We use an extensive set of spectroscopic observations to reinvestigate the properties of the massive binary HDE 228766. Conventional classification criteria suggest that HDE 228766 consists of an O7...
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...
What is the real nature of HD 108 ? (2001)
Naze, Yael, Vreux, Jean-Marie, Rauw, Gregor
Since the beginning of the past century, the nature of HD 108 has been a subject of intense debate. One after another, astronomers explored its variability and attributed it either to binarity, or to...
Marchenko, Sergey V, Rauw, Grégor, Antokhina, Eleonora A, Antokhin, Igor I, Ballereau, Dominique, Chauville, Jacques, ...
With the objective of investigating the wind-wind collision phenomenon and supporting contemporaneous X-ray observations, we have organized a large-scale, coordinated optical monitoring campaign of...
Narrow-band photometry of the eclipsing WN7+O binary WR 22 (1999)
Royer, P, Rauw, Grégor, Manfroid, Jean, Gosset, Eric, Vreux, Jean-Marie
In the present paper, we discuss photometric observations of the February 1996 eclipse of the very massive WR+O binary WR 22. Our data were obtained with a set of narrow-band filters, specially...
New observational results on the colliding wind WR+O binary WR 30a (1999)
Gosset, Eric, Royer, P, Rauw, Grégor, Manfroid, Jean, Vreux, Jean-Marie
On the perspectives of using XMM to study fundamental parameters of early-type stars (1999)
Rauw, Grégor, Van Der Hucht, KA, Mewe, R, Gudel, M, Vreux, Jean-Marie, Gosset, Eric, ...
Search for Interacting Winds in the WN7 + O Binary WR 22 (1996)
Rauw, Grégor, Vreux, Jean-Marie, Gosset, Eric
We present new spectroscopic observations of the He I Lambda5876 line in WR22 which were obtained around periastron. These data show strong line profile variability. We use recently determined...
Rauw, Grégor, Vreux, Jean-Marie, Gosset, Eric
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Line-profile variability and mass-transfer in the early type binary BD+40° 4220 (1996)
Vreux, Jean-Marie, Rauw, Grégor, Bohannan, B, Manfroid, Jean
Not Available
WR22 as a core hydrogen-burning Wolf-Rayet star (1995)
Rauw, Grégor, Vreux, Jean-Marie, Gosset, Eric, Hutsemekers, Damien, Magain, Pierre
The analysis of an extensive sample of high resolution spectra of the Wolf-Rayet binary WR22 recently allowed us to determine a minimum mass of 72 M_solar for the WN7 star. With such a high mass,...