We report on the unprecedented red supergiant (RSG) population of a massive young
cluster, located at the base of the Scutum-Crux Galactic arm. We identify candidate cluster …

This paper gathers, from the literature and private communication, 72 new Galactic
Population I Wolf-Rayet stars and 17 candidate WCLd stars, recognized and/or discovered …

Context. With a mass exceeding several 10 4 M⊙ and a rich and dense population of
massive stars, supermassive young star clusters represent the most massive star-forming …

Context. Wolf–Rayet (WR) stars are massive evolved stars that exhibit particularly fast and
dense stellar winds. Although they constitute a very short phase near the end of a massive …

Aims. We investigate the nature of the X-ray point source population within the Young
Massive Cluster Westerlund 1. Methods. Chandra observations of 18 ks and 42 ks were …

We present a digital atlas of peculiar, high-luminosity massive stars in the near-infrared
region (10 470-11 000 Å) at medium resolution (). The spectra are centered around 10 830 …

ABSTRACT Westerlund 1 (Wd1) is potentially the largest star cluster in the Galaxy. That
designation critically depends upon the distance to the cluster, yet the cluster is highly …

Aims. Current mass-loss rate estimates imply that main sequence line-driven winds are not
sufficient to strip away the H-rich envelope to yield Wolf-Rayet (WR) stars. The rich …

Context. The central region of our Galaxy contains a large population of young massive
stars. These stars are concentrated in three large star clusters, as well as being scattered in …

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 …