In the past decade, a consensus has emerged regarding the nature of classical Be stars:
They are very rapidly rotating main sequence B stars, which, through a still unknown, but …

The interest in X/γ-ray Astronomy has grown enormously in the last decades thanks to the
ability to send X-ray space missions above the Earth's atmosphere. There are more than half …

Recent results for classical Be stars are reviewed and links to general astrophysics are
presented. Classical Be stars are B‐type stars close to the main sequence that exhibit line …

Context. HR 6819 was recently proposed to be a triple system consisting of an inner B-type
giant plus black hole (BH) binary with an orbital period of 40 d and an outer Be tertiary. This …

We study accretion processes for tidally disrupted stars approaching supermassive black
holes on bound orbits, by performing three-dimensional smoothed particle hydrodynamics …

ABSTRACT A star coming too close to a supermassive black hole gets disrupted by the tidal
force of the compact object in a tidal disruption event, or TDE. Following this encounter, the …

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 …

High mass X-ray binaries are among the brightest X-ray sources in the Milky Way, as well as
in nearby Galaxies. Thanks to their highly variable emissions and complex phenomenology …

ABSTRACT LS I+ 61 303 and LS 5039 are two of only a handful of known high-mass X-ray
binaries (HMXBs) that exhibit very high energy emission in the MeV–TeV range, and these" …

Context. LS I+ 61 303 is a puzzling Be/X-ray binary with variable gamma-ray emission up to
TeV energies. The nature of the compact object and the origin of the high-energy emission …