A varying kHz peak separation in 4U 1608-52

B.A. Vaughan (Caltech); D. Psaltis (Harvard/CfA); E. Kuulkers (University of Oxford); F. K. Lamb (University of Illinois); J. van Paradijs (University of Amsterdam); M. Mendez; M. van der Klis; W.H.G. Lewin (MIT); W. Zhang (NASA/GSFC)

arxiv: astro-ph/9712140 · v1 · submitted 1997-12-10 · 🌌 astro-ph

A varying kHz peak separation in 4U 1608-52

M. Mendez , M. van der Klis , J. van Paradijs (University of Amsterdam) , W.H.G. Lewin (MIT) , B.A. Vaughan (Caltech) , E. Kuulkers (University of Oxford) , W. Zhang (NASA/GSFC) , F. K. Lamb (University of Illinois)

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D. Psaltis (Harvard/CfA)

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keywords peakmarchseparationatollcasedatadiscoveredfirst

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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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A varying kHz peak separation in 4U 1608-52

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