Poster abstract details

We present simultaneous timing and spectral analysis of the persistent low luminosity High Mass X-ray Binary, Swift J045106.8-694803. The spectral analysis reveals the presence of a blackbody with temperature kT=1.8$\pm$0.3 keV, we attribute to emission from the neutron star polar caps. We simulate the spectrum at different pulse phases to reproduce the anti correlation seen between the pulsed profile and the hardness ratio. These simulations suggest that this is caused by the pulsations of the blackbody being $\sim\pi$ out of phase with those of the power law component. Using a simple model for emission from hot spots on the neutron star surface, we fit the pulse profile of the blackbody component to obtain an indication of the geometry of the system.