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WR~102-1 was detected by Suzaku as a conspicuous point source in the 6.7 keVintensity map of the central region of the Milky Way. The source was suggestedas a possible Wolf-Rayet binary based on its X-ray and infrared spectralcharacteristics. The iron line emission is expected to originate in theWolf-Rayet star's dynamic stellar-wind when colliding the companion's mildstellar wind. Here, we report the result of a long-term X-ray monitoring ofWR~102-1 since 1998 using archival data of ASCA, XMM-Newton, Chandra, Suzaku,and Swift to reveal variations of the iron K-emission line and thecircumstellar absorption. Consequently, we have detected significant redshiftsof the iron K-emission line from the XMM-Newton observation in March 2003 andthe Suzaku observation in September 2006. Furthermore, when the red-shift wasobserved, which suggests that the Wolf-Rayet star was in front of the companionstar, the circumstellar absorption values were smaller than other periods.These results appear contrary to the expectation if the Wolf-Rayet's stellarwind is spherically symmetric, but may be understood if the Wolf-Rayet star'sstellar wind is significantly distorted due to the rapid orbital motion nearthe periastron.

Long Term X-Ray Spectral Variation of the Wolf-Rayet Binary WR 102-1 in the Galactic bulge: evidence for wind distortion in the binary