91 citations · 635 across the 23 of their papers we have counts for
13 papers · 1 filter
Long-term variability of the 35-day cycle in Her X-1
Vladislav Revnivtsev, Konstantin Postnov, Ruediger Staubert +3
Her X-1 is an eclipsing X-ray binary system consisting of an accreting neutron star and an optical component HZ Her. In addition to the 1.24-s X-ray pulsations and the 1.7-d orbita…
Spin-down of the accreting magnetar candidate 4U 0114+65: possible first evidence for a strong coupling regime
Graciela Sanjurjo-Ferrín, Jose Miguel Torrejón, Konstantin Postnov +3
4U~0114+65 is a high-mass X-ray binary composed of the B1\,Ia supergiant V*~V662~Cas and one of the slowest known accreting neutron stars, with a spin period of 9.4 ks. In 20…
Luminosity-dependent changes of the cyclotron line energy and spectral hardness in Cep X-4
V. Vybornov, D. Klochkov, M. Gornostaev +5
X-ray spectra of accreting pulsars are generally observed to vary with their X-ray luminosity. In particular, the hardness of the X-ray continuum is found to depend on luminosity.…
INTEGRAL study of temporal properties of bright flares in Supergiant Fast X-ray Transients
L. Sidoli, A. Paizis, K. Postnov
We have characterized the typical temporal behaviour of the bright X-ray flares detected from the three Supergiant Fast X-ray Transients showing the most extreme transient behaviou…
On the dependence of the X-ray continuum variations with luminosity in accreting X-ray pulsars
K. A. Postnov, M. I. Gornostaev, D. Klochkov +3
Using RXTE/ASM archival data, we investigate the behaviour of the spectral hardness ratio as a function of X-ray luminosity in a sample of six transient X-ray pulsars (EXO 2030+375…
Theory of wind accretion
N. I. Shakura, K. A. Postnov, A. Yu. Kochetkova +1
A review of wind accretion in high-mass X-ray binaries is presented. We focus attention to different regimes of quasi-spherical accretion onto the neutron star: the supersonic (Bon…
Thermal Emission in Gamma-Ray Burst Afterglows
D. A. Badjin, S. I. Blinnikov, K. A. Postnov
We study thermal emission from circumstellar structures heated by gamma-ray burst (GRB) radiation and ejecta and calculate its contribution to GRB optical and X-ray afterglows usin…
Pulse phase and precession phase resolved spectroscopy of Her X-1: studying a representative Main-On with RXTE
D. Vasco, R. Staubert, D. Klochkov +3
We performed a detailed pulse phase resolved spectroscopy of the accreting binary X-ray pulsar Her X-1 in the energy range 3.5-75 keV and have established pulse phase profiles for…
Peculiar outburst of A 0535+26 observed with INTEGRAL, RXTE and Suzaku
I. Caballero, K. Pottschmidt, L. Barragan +17
A normal outburst of the Be/X-ray binary system A0535+26 has taken place in August 2009. It is the fourth in a series of normal outbursts that have occured around the periastron pa…
Monitoring of pulse period in Her X-1 with Swift/BAT: evidence of mass ejection
D. Klochkov, R. Staubert, K. Postnov +2
Monitoring of pulse period variations in accreting binary pulsars is an important tool to study the interaction between the magnetosphere of the neutron star and the accretion disk…
Variable precession of the neutron star in Her X-1
R. Staubert, D. Klochkov, K. Postnov +3
We present evidence for an identical behavior of the precession of the accretion disk and that of the neutron star (NS) in Her X-1, based on investigating the well established 35 d…
Continuous monitoring of pulse period variations in Her X-1 using Swift/BAT
D. Klochkov, R. Staubert, K. Postnov +2
Context: Monitoring of pulse period variations in accreting binary pulsars is an important tool to study the interaction between the magnetosphere of the neutron star and the accre…
Analysis of hard X-ray eclipse in SS433 from INTEGRAL observations
A. M. Cherepashchuk, R. A. Sunyaev, K. A. Postnov +2
The analysis of hard X-ray INTEGRAL observations (2003-2008) of superaccreting galactic microquasar SS433 at precessional phases of the source with the maximum disk opening angle i…