Correlated X-ray spectral and fast-timing behaviour of 4U 1636-53

Details Correlated X-ray spectral and fast-timing behaviour of 4U 1636-53 Correlated X-ray spectral and fast-timing behaviour of 4U 1636-53

1997-01-21

arxiv.org/abs/astro-ph/9701149v1

Astronomy and Astrophysics

Astrophysics

Accepted by Astronomy and Astrophysics, 10 pages, Latex, uses l-aa, full version (including 8 figures) available at http://w

Scientific paper

We present a study of the persistent X-ray emission from the low-mass X-ray binary 4U 1636-53 based ont he entire archival EXOSAT ME data set. We per- formed a homogeneous analysis of all five EXOSAT observations in terms of the correlated rapid X-ray variability and X-ray spectral properties by means of power spectra, and colour-colour and hardness-intensity diagrams, respectively. Over the years we find similar patterns in the colour-colour and hardness-intensity diagrams, but small shifts in their postions occur. We find one case of an island-banana transition. On all but one occasion the differences in colour are smaller than 5%. Between the two 'island state' data sets, we find a shift of 8 % in the soft colour, which must be at least partly intrinsic. Clear correlations are present between the X-ray colours (which are governed by the mass accretion rate) and the power spectrum. With increasing mass accretion rate the fractional rms amplitude of the power-law shaped power spectral component that dominates the power spectra below ~1 Hz rises, while the band-limited noise component at higher frequencies drops. The cut-off frequency of the band-limited component increases whn its amplitude decreases. This is reminiscent of the behaviour of black hole candidates in the low state.

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