Study of X-ray pulsars Cep X-4 and 4U 1907+09

Abstract

The X-ray pulsars Cep X-4 and 4U 1907+09 were observed with the pointed mode proportional counters(PPCs) of Indian X-ray Astronomy Experiment(IXAE) on IRS-P3 satellite. Detailed studies of pulse profile of Cep X-4 revealed an inter-pulse dominated double-pulse profile. In the case of pulsar 4U 1907+09, the pulse period measurements indicate spindown of the pulsar with P=+0.21 s yr−1 using the IXAE observations.