A study on the long term periodicities among the X-ray binaries: Two new superorbital periods

Abstract

Long term behaviours of a few selected X-ray binaries are studied on the basis of RXTE/ASM archive covering a period of similar to 13 years of continuous X-ray data. Two new superorbital periods seem to be revealed for the GX354-0 and X Persei systems as 8.7 years and 345 days, respectively. Although the X Persei system has two strongest peaks in its power density spectrum at 15.7 years and at 345 days, the latter is much more plausible. The GX354-0 system also has few additional periodicities appeared in different time intervals. (C) 2010 WILEY-VCH Verlag GmbH & Co. KGaA. Weinheim