Long-term Properties of Accretion Disks in X-ray Binaries: I. the variable third period in SMC X-1
arXiv:astro-ph/0210241 · doi:10.1046/j.1365-8711.2003.06176.x
Abstract
Long term X-ray monitoring data from the RXTE ASM and CGRO BATSE reveal that the third (superorbital) period in SMC X-1 is not constant, but varies between 40-60 days. A dynamic power spectrum analysis indicates that the third period has been present continuously throughout the five years of ASM observations. This period changed smoothly from 60 days to 45 days and then returned to its former value, on a timescale of approximately 1600 days. During the nearly 4 years of overlap between the CGRO & RXTE missions, the simultaneous BATSE hard X-ray data confirm and extend this variation in SMC X-1. Our discovery of such an instability in the superorbital period of SMC X-1 is interpreted in the context of recent theoretical studies of warped, precessing accretion disks. We find that the behaviour of SMC X-1 is consistent with a radiation-driven warping model.
6 figures Re-submitted to MNRAS after referee's comments
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