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On the Magnetospheric Beat-Frequency and Lense-Thirring Interpretations of the Horizontal Branch Oscillation in the Z Sources by Psaltis, Dimitrios; Wijnands, Rudy; Homan, Jeroen; Jonker, Peter G.; van der Klis, Michiel; Miller, M. Coleman; Lamb, Frederick K.; Kuulkers, Erik; van Paradijs, Jan; Lewin, Walter H. G. is a scholarly article available to read on EtoBox.

What is On the Magnetospheric Beat-Frequency and Lense-Thirring Interpretations of the Horizontal Branch Oscillation in the Z Sources about?

We study the horizontal branch oscillations (HBO) and the two simultaneous kilohertz QPOs comparing their properties in five Z sources with the predictions of the magnetospheric beat-frequency and Lense-Thirring precession models. We find that the variation of the HBO frequency with accretion rate predicted by the magnetospheric beat-frequency model for a purely dipolar stellar magnetic field and a radiation-pressure-dominated inner accretion disk agrees well with the observed variation. This model implies that the neutron stars in the Z sources are near magnetic spin equilibrium, that their magnetic field strengths are ~10^9-10^10 G, and that the critical fastness parameter for these sources is >0.8. If the frequency of the upper kilohertz QPO is an orbital frequency in the accretion disk, the magnetospheric beat-frequency model requires that a small fraction of the gas in the disk does not couple strongly to the stellar magnetic field at 3-4 stellar radii but instead drifts slowly inward in nearly circular orbits until it is within a few kilometers of the neutron star surface. The Lense-Thirring precession model is consistent with the observed magnitudes of the HBO frequencies on

Author
Psaltis, Dimitrios; Wijnands, Rudy; Homan, Jeroen; Jonker, Peter G.; van der Klis, Michiel; Miller, M. Coleman; Lamb, Frederick K.; Kuulkers, Erik; van Paradijs, Jan; Lewin, Walter H. G.
Published
1999
Language
EN

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Browse all works by Psaltis, Dimitrios; Wijnands, Rudy; Homan, Jeroen; Jonker, Peter G.; van der Klis, Michiel; Miller, M. Coleman; Lamb, Frederick K.; Kuulkers, Erik; van Paradijs, Jan; Lewin, Walter H. G.