Young massive clusters (YMCs) are dense aggregates of young stars that form the
fundamental building blocks of galaxies. Several examples exist in the Milky Way Galaxy …

The striking broad emission line spectroscopic appearance of Wolf-Rayet (WR) stars has
long defied analysis, owing to the extreme physical conditions within their line-and …

The Binary Population and Spectral Synthesis suite of binary stellar evolution models and
synthetic stellar populations provides a framework for the physically motivated analysis of …

Spectroscopic analyses of hydrogen-rich WN 5–6 stars within the young star clusters NGC
3603 and R136 are presented, using archival Hubble Space Telescope and Very Large …

Understanding the physical processes that govern the dynamical behavior of the interstellar
medium (ISM) is central to much of modern astronomy and astrophysics. The ISM is the …

Models of rotating single stars can successfully account for a wide variety of observed stellar
phenomena, such as the surface enhancements of N and He observed in massive main …

Massive stars influence their surroundings through radiation, winds, and supernova
explosions far out of proportion to their small numbers. However, the physical processes that …

We construct revised near-infrared absolute magnitude calibrations for 126 Galactic Wolf–
Rayet (WR) stars at known distances, based in part upon recent large-scale spectroscopic …

Chemically homogeneous evolution (CHE) is a promising channel for forming massive
binary black holes. The enigmatic, massive Wolf–Rayet binary HD 5980 A&B has been …

Aims. Results from γ-ray observations by the HESS telescope array in the direction of the
young stellar cluster Westerlund 2 are presented. Methods. Stereoscopic imaging of …