Bulletin of the Astronomical Society of India
B. Paul11*, H. Raichur2, C. Jain3, M. James1,4, J. Devasia1,4 and S. Naik 5
1Raman Research Institute, C. V. Raman Avenue, Sadashivanagar, Bangalore 560080, India
2IUCAA, Post Bag 4, Ganeshkhind, Pune 411 007, India
3Hans Raj College, University of Delhi, Delhi 110007, India
4Mahatma Gandhi University, Kottayam 686560, Kerala, India
5Physical Research Laboratory, Navarangapura, Ahmedabad 380009, Gujarat, India
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We have measured the orbital period derivatives in several high mass and low mass X-ray binaries. Mechanisms that could be responsible for the observed orbital evolution in these sources are briefly mentioned. We also describe studies of quasi-periodic oscillations in several X-ray pulsars and their relation with long term evolution of these systems and also the neutron star magnetic field strength.
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Keywords : X-rays: binaries – X-rays: individual – pulsars: general