A varying kHz peak separation in 4U 1608-52

Details A varying kHz peak separation in 4U 1608-52 A varying kHz peak separation in 4U 1608-52

1997-12-10

arxiv.org/abs/astro-ph/9712140v1

Astronomy and Astrophysics

Astrophysics

Aipproc LaTeX (4 pages, 2 ps-figures), to appear in "Accretion Processes in Astrophysical Systems", Proc. of the 8th Annual As

Scientific paper

10.1063/1.55922

Using a new technique to improve the sensitivity to weak Quasi-Periodic Oscillations (QPO) we discovered a new QPO peak at about 1100 Hz in the March 1996 outburst observations of 4U 1608-52, simultaneous with the ~ 600-900 Hz peak previously reported from these data. The frequency separation between the upper and the lower QPO peak varied significantly from $232.7 \pm 11.5$ Hz on March 3, to $293.1 \pm 6.6$ Hz on March 6. This is the first case of a variable kHz peak separation in an atoll source.

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