Massive stars play a key role in environments with very different metallicities. To interpret the role of massive stars in these systems we have to know their...

We are on the cusp of a revolution in massive star research triggered by 2MASS and Spitzer/GLIMPSE, and now is the ideal time to capitalize on these projects by...

We present the first results of a project aimed at the combined study of massive stars and their surrounding nebulae by means of a detailed study of Galactic H...

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The Carina Nebula complex consists of several stellar groups, some bound and some not, immersed in the Car OB1 association, a unique region to study Galactic...

We present observations and analyses of some of the most massive stars in the Milky Way, showing the potential and limits of current model atmospheres, and the...

We probe how common extremely rapid rotation is among massive stars in the early universe by measuring the OBe star fraction in nearby metal-poor dwarf galaxies...

The theory of radiatively-driven winds successfully explains the key points of the stellar winds of hot massive stars. However, it has been recently found that...

Massive stars are key ingredients in the evolution of the Universe. Yet, important uncertainties and limits persist in our understanding of these objects, even...