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2003MNRAS.343.1213C - Mon. Not. R. Astron. Soc., 343, 1213-1223 (2003/August-3)
Long-term properties of accretion discs in X-ray binaries - II. Stability of radiation-driven warping.
CLARKSON W.I., CHARLES P.A., COE M.J. and LAYCOCK S.
Abstract (from CDS):
In Paper I we used a dynamic power spectrum (DPS) analysis of long-term X-ray data sets (Compton Gamma Ray Observatory, Rossi X-Ray Timing Explorer), focusing on the remarkable, smooth variations in the superorbital period exhibited by SMC X-1. Here we use a similar DPS analysis to investigate the stability of the superorbital periodicities in the neutron star XRBs Cyg X-2, LMC X-4 and Her X-1, and thereby confront stability predictions with observation. We find that the period and nature of superorbital variations in these sources are consistent with the predictions of warping theory.
We also use a dynamic light-curve analysis to examine the behaviour of Her X-1 as it enters and leaves the 1999 anomalous low state (ALS). This reveals a significant phase shift some 15 cycles before the ALS, which indicates a change in the disc structure or profile leading into the ALS.
Abstract Copyright: 2003 RAS
Journal keyword(s): accretion, accretion discs - pulsars: general - X-rays: binaries
Simbad objects: 11
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