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Hot stars observed by XMM-Newton - I. The catalog and the properties of OB stars
Aims. Following the advent of increasingly sensitive X-ray observatories, deep observations of early-type stars became possible. However, the results for only a few objects or clusters have until now
Early-type stars in the core of the young open cluster Westerlund 2 ⋆⋆⋆
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
An XMM–Newton view of the young open cluster NGC 6231 – II. The OB star population★
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
X-ray spectroscopy of stars
Non-degenerate stars of essentially all spectral classes are soft X-ray sources. Their X-ray spectra have been important in constraining physical processes that heat plasma in stellar environments to
The Gaia-ESO Public Spectroscopic Survey
The Gaia-ESO Public Spectroscopic Survey has begun and will obtain high quality spectroscopy of some 100000 Milky Way stars, in the field and in open clusters, down to magnitude 19, systematically ...
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. From
WR 20a: a massive cornerstone binary system comprising two extreme early-type stars ⋆
We analyse spectroscopic observations of WR 20a revealing that this star is a massive early-type binary system with a most probable orbital period of ∼3.675 days. Our spectra indicate that both
The Athena X-ray Integral Field Unit (X-IFU)
The core scientific objectives of Athena are reviewed, driving the main performance parameters of the X-IFU, namely the spectral resolution, the field of view, the effective area, the count rate capabilities, the instrumental background and the breakthrough potential.
The Chandra Carina Complex contains 200 known O- and B-type stars. The Chandra survey detected 68 of the 70 O stars and 61 of 127 known B0-B3 stars. We have assembled a publicly available
The ATHENA X-ray Integral Field Unit (X-IFU)
The X-ray Integral Field Unit (X-IFU) is the high resolution X-ray spectrometer of the ESA Athena X-ray observatory. Over a field of view of 5’ equivalent diameter, it will deliver X-ray spectra from