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Orbital Evolution and orbital phase resolved spectroscopy of the HMXB pulsar 4U 1538-52 with RXTE-PCA and BeppoSAX
U. Mukherjee, H. Raichur, B. Paul +2
We report here results from detailed timing and spectral studies of the high mass X-ray binary pulsar 4U~1538--52 over several binary periods using observations made with the Rossi…
Different Types of X-ray Variability Observed in Micro-Quasar GRS 1915+105 with the IXAE
S. Naik, P. C. Agrawal, B. Paul +3
The galactic micro-quasar source GRS 1915+105 has been observed with the Indian X-ray Astronomy Experiment (IXAE) several times over a period extending from 1996 to 2000. The sourc…
Quasi-periodic oscillations discovered in the new X-ray pulsar XTE J1858+034
B. Paul, A. R. Rao
We report the discovery of low frequency quasi-periodic oscillations centered at 0.11 Hz in the newly discovered 221 s X-ray pulsar XTE J1858+034. Among about 30 known transient X-…
Observations of Cygnus X-1 during the two spectral states with the Indian X-ray Astronomy Experiment (IXAE)
A. R. Rao, P. C. Agrawal, B. Paul
We present the time variability characteristics of Cygnus X-1 in its two spectral states. The observations were carried out using the Pointed Proportional Counters (PPC) on-board t…
A double peaked pulse profile observed in GX 1+4
B. Paul, P. C. Agrawal, A. R. Rao +1
The hard X-ray pulsar GX 1+4 was observed several times in the last few years with a pair of balloon-borne Xenon filled Multi-cell Proportional Counters (XMPC). In a balloon flight…
Torque-luminosity correlation and possible evidence for core-crust relaxation in the X-ray pulsar GX 1+4
B. Paul, A. R. Rao, K. P. Singh
We present the detection of a positive correlation between spin-down rate and pulsed X-ray luminosity in the BATSE archival data of the bright hard X-ray pulsar GX 1+4. W…