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We present the results obtained from timing and spectral studies of high massX-ray binary pulsar OAO 1657-415 using a Suzaku observations in 2011 September.X-ray pulsations were detected in the light curves up to $\sim$70 keV. Thecontinuum spectra during the high- and low-flux regions in light curves werewell described by high energy cutoff power-law model along with a blackbodycomponent and iron fluorescent lines at 6.4 keV and 7.06 keV. Time resolvedspectroscopy was carried out by dividing the entire observations into 18 narrowsegments. Presence of additional dense matter at various orbital phases wasconfirmed as the cause of low-flux regions in the observations. Presence ofadditional matter at several orbital phases of the pulsar was interpreted asdue to the inhomogeneously distributed clumps of matter around the neutronstar. Using clumpy wind hypothesis, the physical parameters of the clumpscausing the high- and low-flux episodes in the pulsar light curve wereestimated. The equivalent width of iron emission lines was found to besignificantly large at certain orbital phases of low-flux segments. Weinvestigated the iron line emitting regions and suggest the existence ofneutral and ionized iron atoms in emission sites that are located within theaccretion radius.

Investigation of iron emission lines in the eclipsing high mass X-ray binary pulsar OAO 1657-415