Published January 1, 2021
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A minimal timescale for the continuum in 4U 1608-52 and Aql X-1
- 1. Adiyaman Univ, Dept Phys, Washington, DC 20052 USA
- 2. Sabanci Univ, Fac Engn & Nat Sci, TR-34956 Istanbul, Turkey
- 3. Istanbul Univ, Sci Fac, Dept Astron & Space Sci, TR-34119 University, Turkey
- 4. Sohag Univ, Fac Sci, Dept Phys, Sohag 82524, Egypt
- 5. Cairo Univ, Fac Sci, Dept Phys, Giza 12613, Egypt
Description
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.
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