Cosmic-ray acceleration has been a long-standing mystery, and, despite more than a
century of study, we still do not have a complete census of acceleration mechanisms. The …

We report high-precision X-ray monitoring observations in the 0.4–10 keV band of the
luminous, long-period colliding wind binary Eta Carinae, up to and through its most recent X …

Context. The first soft gamma-ray repeater was discovered over three decades ago, and was
subsequently identified as a magnetar, a class of highly magnetised neutron star. It has …

The long-period, highly eccentric Wolf-Rayet star binary system WR 140 has exceptionally
well-determined orbital and stellar parameters. Bright, variable X-ray emission is generated …

Aims. Colliding wind binary systems have long been suspected to be high-energy (HE; 100
MeV< E< 100 GeV) γ-ray emitters. η Car is the most prominent member of this object class …

The binary system η Carinae is a unique laboratory that facilitates the study of particle
acceleration to high energies under a wide range of conditions, including extremely high …

Context. Eta Carinae is a highly eccentric, massive binary system (semimajor axis~ 15.5 au)
with powerful stellar winds and a phase-dependent wind-wind collision (WWC) zone. The …

Eta Carinae is a massive interacting binary system shrouded in a complex circumstellar
environment whose evolution is the source of the long-term brightening observed during the …

We investigate the structure and X-ray emission from the colliding stellar winds in massive
star binaries. We find that the opening angle of the contact discontinuity (CD) is …

The binary η Carinae is the closest example of a very massive star, which may have formed
through a merger during its Great Eruption in the mid-19th century. We aimed to confirm and …