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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
- B. Paul, F. Nagase, T. Endo, T. Dotani, J. Yokogawa, M. Nishiuchi
- Physics
- 16 July 2002
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
- N. S. Singh, S. Naik, Mumbai
- Physics
- 10 June 2002
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
- S. Naik, B. Paul, Sadashivnagar
- Physics
- 2 June 2011
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
- H. Raichur, B. Paul
- Physics
- 21 August 2010
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
- U. Mukherjee, B. Paul
- Physics
- 27 October 2004
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
- C. Jain, B. Paul, Anjan Dutta
- Physics
- 10 July 2010
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
- S. Naik, B. Paul, Kohima Science College
- Physics
- 2 December 2010
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
- K. Mukerjee, P. C. Agrawal, K. Kasturirangan
- Physics
- 10 February 2001
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
- B. Paul, M. Kawasaki, T. Dotani, F. Nagase
- Physics
- 10 February 2000
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…
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