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A minimal timescale for the continuum in 4U 1608-52 and Aql X-1

2021    Mohamed, K.; Sonbas, E.; Dhuga, K. S.; Gogus, E.; Tuncer, A.; Abd Allah, N. N.; Ibrahim, A.

Similar to black hole X-ray binary transients, hysteresis-like state transitions are also seen in some neutron-star X-ray binaries. Using a method based on wavelets and light curves constructed from archival Rossi X-ray Timing Explorer observations, we extract a minimal timescale over the complete range of transitions for 4U 1608-52 during the 2002 and 2007 outbursts and the 1999 and 2000 outbursts for Aql X-1. We present evidence for a strong positive correlation between this minimal timescale and a similar timescale extracted from the corresponding power spectra of these sources.