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 …

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 …

Close binary interactions may play a critical role in the formation of the rapidly rotating Be
stars. Mass transfer can result in a mass gainer star spun up by the accretion of mass and …

ABSTRACT Using observations from Chandra, Swift, and XMM-Newton, we investigate the
high-energy properties of all known (18) Be+ sdO systems as well as seven additional Be …

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 …

Abstract We used archival International Ultraviolet Explorer (IUE) high-dispersion, short
wavelength spectra data to search for evidence of the spectra of hot subdwarf companions …

The origin of the bright and hard X-ray emission flux among the γ Cas subgroup of B-
emission line (Be) stars may be caused by gas accretion onto an orbiting white dwarf (WD) …

We present the results of a multiplicity survey for a magnitude-limited sample of 31 classical
Be stars conducted with the Navy Precision Optical Interferometer and the Mark III Stellar …

Be stars are surrounded by outflowing circumstellar matter structured in the form of decretion
discs. They are often members of binary systems, where it is expected that the decretion disc …