Periodic variability during the X-ray decline of 4U 1636-53

Bibcode
2005MNRAS.361..602S
DOI
10.1111/j.1365-2966.2005.09224.x
Shih, I. C.; Bird, A. J.; Charles, P. A.; Cornelisse, R.; Tiramani, D.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 361, Issue 2, pp. 602-606.

Advertised on:
8
2005
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
5
IAC number of authors
0
Citations
28
Refereed citations
26
Description
We report the onset of a large amplitude, statistically significant periodicity (~46 d) in the Rossi X-ray Timing Explorer/All Sky Monitor (RXTE/ASM) data of the prototype X-ray burster 4U 1636-53, the X-ray flux of which has been gradually declining over the last 4 yr. This behaviour is remarkably similar to that observed in the neutron star low mass X-ray binary (LMXB), KS 1731-260, which is a long-term transient. We also report on an INTEGRAL/IBIS observation of 4U 1636-53 during its decline phase, and find that the hard X-ray flux (20-100 keV) indicates an apparent anticorrelation with soft X-rays (2-12 keV). We argue that 4U 1636-53 is transiting from activity to quiescence, as occurred in KS 1731-260. We also suggest that the variability during the X-ray decline is the result of an accretion rate variability related to the X-ray irradiation of the disc.
Type
Refereed
Accretion

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