The beat-frequency interpretation of kilohertz quasi-periodic oscillations in neutron star low-mass X-ray binaries

Dimitrios Psaltis, Mariano Méndez, Rudy Wijnands, Jeroen Homan, Peter G. Jonker, Michiel Van Der Klis, Frederick K. Lamb, Erik Kuulkers, Jan Van Paradijs, Walter H.G. Lewin

Research output: Contribution to journalArticle

57 Scopus citations

Abstract

Pairs of quasi-periodic oscillations (QPOs) at kilohertz frequencies are a common phenomenon in several neutron-star low-mass X-ray binaries. The frequency separation of the QPO peaks in the pair appears to be constant in many sources and directly related to the neutron star spin frequency. However, in Sco X-1 and possibly in 4U 1608252, the frequency separation between the QPO peaks decreases with increasing inferred mass accretion rate. We show that the currently available Rossi X-Ray Timing Explorer data are consistent with the hypothesis that the peak separations in all sources vary by amounts similar to the variation in Sco X-1. We discuss the implications for models of the kilohertz QPOs.

Original languageEnglish (US)
Pages (from-to)L95-L99
JournalAstrophysical Journal Letters
Volume501
Issue number1
DOIs
StatePublished - Jul 1 1998

Keywords

  • Accretion
  • Accretion disks
  • Stars: neutron
  • X-rays: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Psaltis, D., Méndez, M., Wijnands, R., Homan, J., Jonker, P. G., Van Der Klis, M., Lamb, F. K., Kuulkers, E., Van Paradijs, J., & Lewin, W. H. G. (1998). The beat-frequency interpretation of kilohertz quasi-periodic oscillations in neutron star low-mass X-ray binaries. Astrophysical Journal Letters, 501(1), L95-L99. https://doi.org/10.1086/311455