Context. The star cluster R136 inside the Large Magellanic Cloud hosts a rich population of
massive stars, including the most massive stars known. The strong stellar winds of these …

Previous generations of X-ray observatories revealed a group of massive binaries that were
relatively bright X-ray emitters. This was attributed to emission of shock-heated plasma in the …

Building on results from the Magnetism in Massive Stars (MiMeS) project, this paper shows
how a two-parameter classification of massive-star magnetospheres in terms of the magnetic …

We examine substructure and mass segregation in the massive OB association Cygnus OB2
to better understand its initial conditions. Using a well-understood Chandra X-ray selected …

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 …

Magnetically confined winds of early-type stars are expected to be sources of bright and
hard X-rays. To clarify the systematics of the observed X-ray properties, we have analyzed a …

Nearly all types of massive stars with radiatively driven stellar winds are X-ray sources that
can be observed by the presently operating powerful X-ray telescopes. In this review I briefly …

Aims. The B fields in OB stars (BOB) Collaboration is based on an ESO Large Programme to
study the occurrence rate, properties, and ultimately the origin of magnetic fields in massive …

ABSTRACT The Great Nebula in Carina provides an exceptional view into the violent
massive star formation and feedback that typifies giant H ii regions and starburst galaxies …

We present new UBVI c CCD photometry of the young open clusters Trumpler 14 (Tr 14) and
Trumpler 16 (Tr 16) in the η Carina Nebula. We also identify the optical counterpart of …