Recent Hardness and Spectral Analysis of X-Persei Zeynep Acuner Department of Physics Middle East Technical University Ankara, Turkey September 18, 2014 Abstract We present the recent hardness and spectral analysis results of the Be type high-mass X-ray binary X- Persei.Using the observations made over the period 1998 to 2002 by Proportional Counter Array of the Rossi X-ray Timing Explorer,we have traced the changes in soft (3-7 to 7-10 keV) and hard colors (10- 15 to 15-20 keV) and compared these trends with the previously published timing and spectral prop- erties. We have discussed the possibility of different accretion modes and the temporary formation of an accretion disk around the pulsar 4U 0352+309 via the quasi-spherical accretion from Be companion’s stellar wind. 1 Introduction Hardness analysis have been carried out for many Low Mass X-Ray Binaries (LMXBs) and recently it has been regarded as a good probe of the depen- dence of photons on specific energies in High Mass X-Ray Binary sources as well. Many bright Be Type X-Ray Binaries (HMXBs) are studied in this aspect (see Reig et al. 2008, Reig et al 2013, Reig 2008). An hardness anal- ysis provides one with a meaningful insight about the origin of photons in different times, without the need of the preliminary assumption of a spec- tral model. An expectable behavior for an accreting X-ray binary would be 1