Magnetic storms on stars manifest as remarkable, randomly occurring changes of the
luminosity over durations that are tiny in comparison to the normal evolution of stars. These …

We explore the scenario of a coronal mass ejection (CME) being the cause of the observed
continuous X-ray absorption of the 1997 August 30 superflare on the eclipsing binary Algol …

We present an evolutionary scenario for the spin-up and evolution of binary millisecond
pulsars, according to which the companion of the pulsar PSR J1740-5340, recently …

We applied a revised model for non-conservative mass transfer in semi-detached binaries to
18 Algol-type binaries showing orbital period increase or decrease in their parabolic O− C …

The class of double period variables (DPVs) consists of close interacting binaries, with a
characteristic long period that is an order of magnitude longer than the corresponding orbital …

Context. During the mass-transfer phase in Algol systems, a large amount of mass and
angular momentum are accreted by the gainer star, which can be accelerated up to its …

We summarize the development of the field of Double Periodic Variables (DPVs, Mennickent
et al. 2003) during the last fourteen years, placing these objects in the context of …

V 393 Scorpii is a double periodic variable characterized by a relatively stable non-orbital
photometric cycle of 253 d. Mennickent et al. argue for the presence of a massive optically …

It is generally thought that conservative mass transfer in Algol binaries causes their orbits to
be wider, so that the less massive star overflows its Roche lobe. The observed decrease in …

Context. A detailed study of the close interacting binary V4142 Sgr, based on photometric
and spectroscopic analyses, indicates that this system belongs to the enigmatic class of …