Massive stars play a major role in the evolution of their host galaxies and serve as important
probes of the distant Universe. It has been established that the majority of massive stars …

Recent studies of high-redshift galaxies with James Webb Space Telescope (JWST), such
as GN-z11 at z= 10.6, show unexpectedly significant amounts of nitrogen (N) in their spectra …

Context. Very massive stars (VMS) have masses in excess of 100 M⊙ and are rare.
However, owing to their powerful winds, very high luminosity, and efficient nucleosynthesis …

Very massive stars (VMS) up to 200–300 M⊙ have been found in the Local Universe. If they
would lose little mass, they produce intermediate-mass black holes or pair-instability …

Super star cluster (SSC) A1 () in NGC 3125 has one of the strongest (Å) broad (km s− 1) He
ii λ1640 emission lines in the nearby universe and constitutes an important template for …

The stellar initial mass function (IMF) is commonly interpreted to be a scale-invariant
probability density distribution function (PDF) such that many small clusters yield the same …

Pair-instability supernovae (PISNe) have crucial implications for many astrophysical topics,
including the search for very massive stars, the black hole mass spectrum, and galaxy …

We study the formation of globular clusters (GCs) in massive compact clouds with the low
metallicity of Z= 10− 3 Z⊙ by performing three-dimensional radiative-hydrodynamic …

Long-period radio transients have unusual properties that challenge their interpretation as
pulsars or magnetars. We examine whether they might instead be powered by primordial …

Context. The upper stellar mass limit is a fundamental parameter for simulations of star
formation, galactic chemical evolution, and stellar feedback. An empirical bound on this …