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We have performed a detailed pulse phase resolved spectral analysis of thecyclotron resonant scattering features (CRSF) of the two Be/X-ray pulsarsA0535+26 and XTE J1946+274 and the wind accreting HMXB pulsar 4U 1907+09 usingSuzaku observations. The CRSF parameters vary strongly over the pulse phase andcan be used to map the magnetic field and a possible deviation form the dipolegeometry in these sources. It also reflects the conditions at the accretioncolumn and the local environment over the changing viewing angles. The patternof variation with pulse phase are obtained with more than one continuumspectral models for each source, all of which give consistent results. Care isalso taken to perform the analysis over a stretch of data having constantspectral characteristics and luminosity to ensure that the results reflect thevariations due to the changing viewing angle alone. For A0535+26 and XTEJ1946+274 which show energy dependent dips in their pulse profiles, a partialcovering absorber is added in the continuum spectral models to take intoaccount an additional absorption at those phases by the accretion stream/columnblocking our line of sight.

Pulse phase dependent variations of the cyclotron absorption features of the accreting pulsars A 0535+26, XTE J1946+274 and 4U 1907+09 with Suzaku