A varying kHz peak separation in 4U 1608-52
Abstract
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 11.5 Hz on March 3, to 293.1 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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