Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-05-10
Mon.Not.Roy.Astron.Soc. 361 (2005) 602-606
Astronomy and Astrophysics
Astrophysics
6 pages. Accepted by MNRAS
Scientific paper
10.1111/j.1365-2966.2005.09224.x
We report the onset of a large amplitude, statistically significant periodicity (~46 d) in the 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 four years. This behaviour is remarkably similar to that observed in the neutron star 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 anti-correlation 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.
Bird Andrew J.
Charles Phil A.
Cornelisse Remon
Shih Chun I.
Tiramani D.
No associations
LandOfFree
Periodic Variability During the X-ray Decline of 4U 1636-53 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Periodic Variability During the X-ray Decline of 4U 1636-53, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Periodic Variability During the X-ray Decline of 4U 1636-53 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-313407