Re-analysis of Timing Parameters of OAO 1657-415
  In this paper, we present the re-analysis of a set of RXTE-PCA observations of OAO 1657-415 during 1997 August 20-27. We found a revised timing solution which was found to fit better to the data and updated pulse frequency values accordingly. We also verified that there is a marginal correlation between the gradual spin-up (or decrease in spin-down rate) and increase in X-ray luminosity as suggested by Baykal (2000). 
A. Baykal (1), S.C. Inam (2), B. Icdem (1), E. Beklen (3) ((1) METU,   (2) Baskent University, (3) Suleyman Demirel University)
astro-ph.HE