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2005MNRAS.361..855B - Mon. Not. R. Astron. Soc., 361, 855-860 (2005/August-2)
An abrupt drop in the coherence of the lower kHz quasi-periodic oscillations in 4U 1636-536.
BARRET D., OLIVE J.-F. and MILLER M.C.
Abstract (from CDS):
The quality factor provides a measure of the coherence of the underlying oscillator. For exponentially damped sinusoidal shots, the highest Q observed corresponds to an oscillator coherence time of 1/πΔν∼ 0.1 s. All existing QPO models face challenges in explaining such a long coherence time and the significantly different behaviours of the quality factors of the upper and lower QPOs reported here. It is therefore difficult to be certain of the implications of the abrupt change in the lower QPO at ∼850 Hz. We discuss various possible causes, including that the drop in coherence is ultimately caused by effects related to the innermost stable circular orbit.
Abstract Copyright: 2005 RAS
Journal keyword(s): accretion, accretion discs - stars: individual: 4U 1636-536 - stars: neutron - X-rays: stars
CDS comments: In Chap.3 : SAX J1808-3658 = SAX J1808.6-3658.
Simbad objects: 4
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