Correlated X-ray spectral and fast-timing behaviour of 4U 1636-53
| dc.creator | Prins, S. | |
| dc.creator | van der Klis, M. | |
| dc.date | 1997-01-21 | |
| dc.date.accessioned | 2026-07-07T02:22:45Z | |
| dc.date.available | 2026-07-07T02:22:45Z | |
| dc.description | 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. | |
| dc.description | Accepted by Astronomy and Astrophysics, 10 pages, Latex, uses l-aa, full version (including 8 figures) available at http://www.astro.uva.nl/preprints/preprints.html, AIAP preprint nr 60 | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9701149 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9701149 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/10991 | |
| dc.subject | Astrophysics | |
| dc.title | Correlated X-ray spectral and fast-timing behaviour of 4U 1636-53 | |
| dc.type | text |