Early-type stars in the core of the young open cluster Westerlund 2 ⋆⋆⋆

@article{Rauw2006EarlytypeSI,
  title={Early-type stars in the core of the young open cluster Westerlund 2 ⋆⋆⋆},
  author={Gregor Rauw and Jean Manfroid and Eric Gosset and Ya{\"e}l Naz{\'e} and Hugues Sana and Micha{\"e}l De Becker and C'edric Foellmi and Anthony F. J. Moffat},
  journal={Astronomy and Astrophysics},
  year={2006},
  volume={463},
  pages={981-991}
}
Aims. The properties of the early-type stars in the core of the Westerlund 2 cluster are examined in order to establish a link bet ween the cluster and the very massive Wolf-Rayet binary WR 20a as well as the Hii complex RCW 49. Methods. Photometric monitoring as well as spectroscopic observations of Westerlund 2 are used to search for light variability and to establish the spectral types of the early-type stars in the c luster core. Results. The first light curves of the eclipsing binary WR… Expand

Figures and Tables from this paper

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
Chandra monitoring of the very massive binary WR20a and the young massive cluster Westerlund 2
Context. Westerlund 2 is a young, massive, obscured stellar cluster of our Galaxy. It harbors the most massive star with well determined parameters, WR20a (82+83M⊙), a dozen very early O-type starsExpand
A newly discovered young massive star cluster at the far end of the Galactic Bar
We present a near-infrared study of the candidate star cluster Mercer 81, located at the centre of the G338.4+0.1 H ii region and close to the TeV gamma-ray source HESS 1640–465. Using Hubble SpaceExpand
Is the massive star cluster Westerlund 2 double? - A high resolution multi-band survey with the Hubble Space Telescope
Abstract Westerlund 2 (Wd2) is one of the most massive young star clusters known in the Milky Way. The close proximity (4.16 kpc) to the Sun, and the young age (2.0 Myr) allow us to study starExpand
Fundamental parameters of four massive eclipsing binaries in Westerlund 1
Context. Only a small number of high mass stars (> 30 M-circle dot) have fundamental parameters (i.e. masses and radii) measured with high enough accuracy from eclipsing binaries to constrainExpand
Massive open star clusters using the VVV survey III. A young massive cluster at the far edge of the Galactic bar
Context. Young massive clusters are key to map the Milky Way’s structure, and near-infrared large area sky surveys have contributed strongly to the discovery of new obscured massive stellar clusters.Expand
NEAR-INFRARED SPECTRA OF GALACTIC STELLAR CLUSTERS DETECTED ON SPITZER/GLIMPSE IMAGES*
We present near-infrared spectroscopic observations of massive stars in three stellar clusters located in the direction of the inner Galaxy. One of them, the Quartet, is a new discovery while theExpand
The Distance to the Massive Galactic Cluster Westerlund 2 from a Spectroscopic and HST Photometric Study
We present a spectroscopic and photometric determination of the distance to the young Galactic open cluster Westerlund 2 using WFPC2 imaging from the Hubble Space Telescope (HST) and ground-basedExpand
The circumstellar environment and evolutionary state of the supergiant B[e] star Wd1-9
Context. Historically, supergiant (sg)B[e] stars have been difficult to include in theoretical schemes for the evolution of massive OB stars. Aims. The location of Wd1-9 within the coeval starburstExpand
The distance to the young open cluster Westerlund 2
A new X-ray, UBVRIc ,a ndJHKs study of the young cluster Westerlund 2 was undertaken to resolve discrepancies tied to the cluster’s distance. Existing spectroscopic observations for bright clusterExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 32 REFERENCES
A GLIMPSE OF STAR FORMATION IN THE GIANT H ii REGION RCW 49
GLIMPSE imaging using the Infrared Array Camera (IRAC) on the Spitzer Space Telescope indicates that star formation is ongoing in the RCW 9 giant H II region. A photometric comparison of the sourcesExpand
O stars with weak winds: the Galactic case
We study the stellar and wind properties of a sample of Galactic O dwarfs to track the conditions under which weak winds (i.e mass loss rates lower than � 10 −8 M⊙ yr −1 ) appear. The sample isExpand
WR 20a Is an Eclipsing Binary: Accurate Determination of Parameters for an Extremely Massive Wolf-Rayet System
We present a high-precision I-band light curve for the Wolf-Rayet binary WR 20a, obtained as a subproject of the Optical Gravitational Lensing Experiment. Rauw et al. have recently presentedExpand
Lower mass loss rates in O-type stars: Spectral signatures of dense clumps in the wind of two Galactic O4 stars
We have analyzed the far-ultraviolet spectrum of two Galactic O4 stars, the O4If+ supergiant HD 190429A and the O4V((f)) dwarf HD 96715, using archival FUSE and IUE data. We have conducted aExpand
A New Spectral Classification System for the Earliest O Stars: Definition of Type O2
High-quality, blue-violet spectroscopic data are collected for 24 stars that have been classified as type O3 and that display the hallmark N IV and N V lines. A new member of the class is presented;Expand
A first detailed study of the colliding wind WR+O binary WR 30a
We present a detailed, extensive investigation of the photometric and spectroscopic behaviour of WR 30a. This star is definitely a binary system with a period around 4.6 d. We propose the value . TheExpand
UBVJHK synthetic photometry of Galactic O stars
Aims. The development of powerful infrared observational technics enables the study of very extincted objects and young embedded star forming regions. This is especially interesting in the cont extExpand
The spectrum of the very massive binary system WR 20a (WN6ha + WN6ha): Fundamental parameters and wind interactions
We analyse the optical spectrum of the very massive binary system WR 20a (WN6ha + WN6ha). The most prominent emission lines, Hα and He  λ 4686, display strong phase-locked profile variability. FromExpand
MSX mid-infrared imaging of massive star birth environments – II. Giant H ii regions
We conduct a Galactic census of giant H II (GH II) regions, based on the all-sky 6-cm data set of Kuchar & Clark, plus the kinematic distances obtained by Russeil. From an inspection of mid-infraredExpand
Optimization of Starburst99 for Intermediate-Age and Old Stellar Populations
We have incorporated the latest release of the Padova models into the evolutionary synthesis code Starburst99. The Padova tracks were extended to include the full asymptotic giant branch (AGB)Expand
...
1
2
3
4
...