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 …

Vortex fiber nulling (VFN) is a technique for detecting and characterizing faint companions at
small separations from their host star. A near-infrared (∼ 2.3 μm) VFN demonstrator mode …

Rapid rotation and nonradial pulsations enable Be stars to build decretion disks, where the
characteristic line emission forms. A major but unconstrained fraction of Be stars owe their …

The multiplicity of massive stars is known to be significantly high. Even though the majority of
massive stars are located in binary systems, the census of binaries is biased toward shorter …

Aims. We report the discovery and analysis of a periodic methanol maser in the massive
protostar IRAS 20216+ 4104. Methods. To obtain the light curve, we used the 6.7 GHz …

Galactic cosmic rays (GCRs) constitute a significant part of the energy budget of our Galaxy,
and the study of their accelerators is of high importance in modern astrophysics. Their main …

The contact phase represents a crossroad in the evolution of massive binary stars.
Depending on the internal physics, the predicted end products can vary greatly including …

The recently discovered Gaia BH1 binary system, a Sun-like star and a dark object
(presumably a black hole), may significantly change our understanding of the population of …

As massive binary companions age they will swell to dimensions comparable to the distance
between stars. The larger star will likely begin transferring mass to its companion, which will …

Multiplicity is a common outcome of the star formation process that occurs across orders of
magnitude in primary mass and orbital separation, from brown dwarfs to O-stars and out to …