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Discovery of a short orbital period in the Supergiant Fast X-ray Transient IGR J16479–4514
We report here the discovery of a 3.32 d orbital period in the Supergiant Fast X-ray Transient (SFXT) source IGR J16479−4514. Using the long-term light curve of this source obtained with Swift Burst
Nature of the Soft Spectral Component in the X-ray Pulsars SMC X-1 and LMC X-4
We present here the results of an investigation of the pulse averaged and pulse phase resolved energy spectra of two high luminosity accretion powered X-ray pulsars SMC X-1 and LMC X-4 made with
New measurements of orbital period change in Cygnus X-3
The nonlinear nature of the binary ephemeris of Cygnus X-3 indicates either a change in the orbital period or an apsidal motion of the orbit. We have made extended observations of Cygnus X-3 with the
X-ray Spectroscopy of the High Mass X-ray Binary Pulsar Centaurus X-3 over its Binary Orbit
We present a comprehensive spectral analysis of the high mass X-ray binary (HMXB) pulsar Centaurus X-3 with the Suzaku observatory covering nearly one orbital period. The light curve shows the
Apsidal motion in 4U 0115+63 and orbital parameters of 2S 1417−624 and V0332+53
Be/X-ray binary pulsars have wide eccentric orbits and hence the angle of periastron of the orbit is very well defined in these sources. The presence of an X-ray pulsar allows for accurate
X-ray properties of the transient pulsar 3A 0535+262 in quiescence
We present the timing and spectral properties of the transient Be/X-ray binary pulsar 3A 0535+262 during quiescence using three observations with the narrow field imaging instruments (NFI) of
New measurement of orbital and spin period evolution of the accretion disc corona source 4U 1822−37
4U 1822-37 is a low mass X-ray binary (LMXB) system with an accretion disc corona. It is one of the very few LMXBs that shows narrow X-ray eclipses and small amplitude pulsations of the neutron star.
Suzaku observation of the transient X-ray pulsar GRO J1008−57
We report the timing and broad-band spectral properties of the Be transient high-mass X-ray binary pulsar GRO J1008−57 using a Suzaku observation in the declining phase of its 2007 November and
Pulse Characteristics of the X-Ray Pulsar 4U 1907+09
The X-ray pulsar 4U 1907+09 was observed in the 2-18 keV energy band with the Indian X-Ray Astronomy Experiment (IXAE) during 1996 August and again in 1998 June. From the timing measurements, the
Study of the Long Term Stability of two Anomalous X-ray Pulsars 4U 0142+61 and 1E 1048.1-5937 with ASCA
We present new observations of two anomalous X-ray pulsars (AXPs), 4U 0142+61 and 1E 1048.1-5937, made in 1998 with ASCA. The energy spectrum of each of these two AXPs is found to consist of two