245 citations · 471 across the 13 of their papers we have counts for
12 papers · 1 filter
Spin-up/spin-down of neutron star in Be-X-ray binary system GX 304-1
K. A. Postnov, A. I. Mironov, A. A. Lutovinov +3
We analyze spin-up/spin-down of the neutron star in Be X-ray binary system GX\,304-1 observed by \textit{Swift}/XRT and \textit{Fermi}/GBM instruments in the period of the source a…
Wind accretion: Theory and Observations
N. I. Shakura, K. A. Postnov, A. Yu. Kochetkova +3
A review of wind accretion in HMXB is presented. We focus on different regimes of quasi-spherical accretion onto a NS: supersonic (Bondi) accretion, which takes place when the capt…
Variable neutron star free precession in Hercules X-1 from evolution of RXTE X-ray pulse profiles with phase of the 35-day cycle
K. Postnov, N. Shakura, . R. Staubert +3
Accretion of matter onto the surface of a freely precessing NS with a complex non-dipole magnetic field can explain the change of X-ray pulse profiles of Her X-1 observed by RXTE w…
Do we see accreting magnetars in X-ray pulsars?
K. A. Postnov, N. I. Shakura, A. Yu. Kochetkova +1
Strong magnetic field of accreting neutron stars ( G) is hard to probe by X-ray spectroscopy but can be indirectly inferred from spin-up/spin-down measurement in X-ray pul…
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…
Settling accretion onto slowly rotating X-ray pulsars
N. I. Shakura, K. A. Postnov, A. Yu. Kochetkova +1
Quasi-spherical subsonic accretion onto slowly rotating magnetized NS is considered, when the accreting matter settles down subsonically onto the rotating magnetosphere, forming an…
Quasi-spherical accretion in low-luminosity X-ray pulsars: Theory vs. observations
K. Postnov, N. Shakura, A. Kochetkova +1
Quasi-spherical subsonic accretion can be realized in slowly rotating wind-fed X-ray pulsars (XPSRs) at X-ray luminosities <4 10^{36} erg/s. In this regime the accreting matter set…
Quasi-spherical accretion in X-ray pulsars
K. Postnov, N. Shakura, A. Kochetkova +1
Quasi-spherical accretion in wind-fed X-ray pulsars is discussed. At X-ray luminosities <4 10^{36} erg/s, a hot convective shell is formed around the neutron star magnetosphere, an…
Spin period evolution of GX 1+4
A. González-Galán, E. Kuulkers, P. Kretschmar +4
We aim both to complement the existing data on the spin history of the peculiar accreting X-ray pulsar GX 1+4 with more past and current data from BeppoSAX, INTEGRAL, and Fermi and…
Theory of quasi-spherical accretion in X-ray pulsars
N. Shakura, K. Postnov, A. Kochetkova +1
A theoretical model for quasi-spherical subsonic accretion onto slowly rotating magnetized neutron stars is constructed. In this model the accreting matter subsonically settles dow…
Wind accretion in symbiotic X-ray binaries
K. Postnov, N. Shakura, A. González-Galán +7
The properties of wind accretion in symbiotic X-ray binaries (SyXBs) consisting of red-giant and magnetized neutron star (NS) are discussed. The spin-up/spin-down torques applied t…
Pulse period evolution of GX 1+4
A. González-Galán, E. Kuulkers, P. Kretschmar +4
We report on the long-term evolution of the spin period of the symbiotic X-ray pulsar GX 1+4 and a possible interpretation within a model of quasi-spherical accretion. New period m…