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Optical and near-infrared photometric monitoring of the transient X-ray binary A0538-66 with REM
L. Ducci, S. Covino, V. Doroshenko +3
The transient Be/X-ray binary A0538-66 shows peculiar X-ray and optical variability. Despite numerous studies, the intrinsic properties underlying its anomalous behaviour remain po…
eXTP -- enhanced X-ray Timing and Polarimetry Mission
S. N. Zhang, M. Feroci, A. Santangelo +181
eXTP is a science mission designed to study the state of matter under extreme conditions of density, gravity and magnetism. Primary targets include isolated and binary neutron star…
Luminosity dependence of the cyclotron line and evidence for the accretion regime transition in V 0332+53
Victor Doroshenko, Sergey S. Tsygankov, Alexander A. Mushtukov +4
We report on the analysis of NuSTAR observations of the Be-transient X-ray pulsar V 0332+53 during the giant outburst in 2015 and another minor outburst in 2016. We confirm the cyc…
RT Cru: a look into the X-ray emission of a peculiar symbiotic star
L. Ducci, V. Doroshenko, V. Suleimanov +3
Symbiotic stars are a heterogeneous class of interacting binaries. Among them, RT Cru has been classified as prototype of a subclass that is characterised by hard X-ray spectra ext…
GK Per and EX Hya: Intermediate polars with small magnetospheres
V. Suleimanov, V. Doroshenko, L. Ducci +2
Observed hard X-ray spectra of intermediate polars are determined mainly by the accretion flow velocity at the white dwarf surface, which is normally close to the free-fall velocit…
Propeller effect in two brightest transient X-ray pulsars: 4U 0115+63 and V 0332+53
S. S. Tsygankov, A. A. Lutovinov, V. Doroshenko +3
We present the results of the monitoring programmes performed with the Swift/XRT telescope and aimed specifically to detect an abrupt decrease of the observed flux associated with…