Evolution of Hard X-Ray Spectra Along the Branches in Cir X-1

G. Q. Ding, J. L. Qu, T. P. Li

Using the data from the PCA and HEXTE on board the RXTE satellite, we investigate the evolution of the 3-200 keV spectra of the peculiar low mass X-ray binary (LMXB) Cir X-1 along…