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We present the results obtained from timing and spectral studies of theaccretion powered X-ray pulsar 2S~1417-624 during a giant outburst in 2009 byusing {\it Rossi X-ray Timing Explorer (RXTE)} observations. X-ray pulsationswere detected in the light curves obtained from all epochs of observations. Thepulsar was found to be spinning-up during the outburst. The pulse profiles wereobserved to be strongly dependent on photon energy and luminosity. A doublepeaked profile at lower luminosity evolved into a triple peaked profile at thepeak of the outburst which is further reverted back to a double peakedstructure during the decay of the outburst. An anti-correlation was alsoobserved between the pulse fraction and the source flux. The 3-70 keV energyspectrum of pulsar was well described with a power law modified with highenergy cutoff model along with an iron fluorescence line at 6.4 keV. Based onthe evolution of pulse profile, pulse fraction and spectral parameters acrossobserved luminosity, we interpret our results in terms of changes in the pulsarbeam configuration from sub-critical to super-critical regimes.

Spectral and timing studies of 2S 1417-624 during a giant outburst