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Name:Biswajit Paul


Institution:Raman Research Institute, Bangalore


Country:India




Title:Intenisty and energy dependent profiles of transient HMXB pulsars




Abstract:We will present complex pulse profile evolution during the outbursts of a
set of transient HMXB pulsars. All these sources also show very strong
energy dependence of complex pulse profiles. The pulse profiles appear to be
double peaked upto 10 keV and have a single peak at higher energy. We find
that the energy spectra can be well fitted with a partial covering power-law
model with high energy cutoff and an iron fluorescence line emission. The
pulse phase resolved spectral analysis shows that the partial covering with
high energy cutoff model parameters have significant changes with the pulse
phase. We will show that this spectral model naturally explains the complex
energy dependence of the pulse profiles.





Title:Quasi Periodic Oscillations in High Magnetic Field Accretion Powered  Pulsars




Abstract:We will present discovery and detailed analysis of quasi periodic 
oscillations in several high magnetic field accretion powered pulsars. The QPOs are an  indicator of the magnetic field strength of the neutron star. We will discuss  results from our investigation of the long term behaviour of QPOs in a few sources.





Title:Orbital Evolution and Apsidal Motion of HMXBs




Abstract:Orbital period evolution has now been detected in several high mass  X-ray binaries. The mechanisms that could be responsible for the observed orbital  evolution in these sources will be discussed. We will also discuss the detection of apsidal  motion in a Be X-ray binary 4U 0115+63.








            

            
            

              

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