After decades of fast-paced technical advances, optical/infrared (O/IR) interferometry has
seen a revolution in recent years:▪ The GRAVITY instrument at the Very Large Telescope …

The B emission-line stars are rapid rotators that were probably spun up by mass and
angular momentum accretion through mass transfer in an interacting binary. Mass transfer …

Stars stripped of their hydrogen-rich envelope through interaction with a binary companion
are generally not considered when accounting for ionizing radiation from stellar populations …

Context. With the advent of large spectroscopic surveys, automated stellar parameter
determination has become commonplace. Nevertheless, spectral classification still offers a …

Most massive stars, the progenitors of core-collapse supernovae, are in close binary
systems and may interact with their companion through mass transfer or merging. We …

Recent studies of massive binaries with putative black hole companions have uncovered a
phase of binary evolution that has not been observed before, featuring a bloated stripped …

Rapid rotation is a fundamental characteristic of classical Be stars and a crucial property
allowing for the formation of their circumstellar disks. Past evolution in a mass and angular …

The binary status of γ Cas stars has been discussed while theoretically examining the origin
of their peculiar X-ray emission. However, except in two cases, no systematic radial velocity …

Because many classical Be stars may owe their nature to mass and angular-momentum
transfer in a close binary, the present masses, temperatures, and radii of their components …

Classical Be stars are possible products of close binary evolution, in which the mass donor
becomes a hot, stripped O-or B-type subdwarf (sdO/sdB), and the mass gainer spins up and …