The Beat-Frequency Interpretation of Kilohertz Quasi-periodic Oscillations in Neutron Star Low-Mass X-Ray Binaries | Zendy

Dimitrios Psaltis | Zendy; Mariano Méndez | Zendy; R. Wijnands | Zendy; J. Homan | Zendy; P. G. Jonker | Zendy; M. van der Klis | Zendy; Frederick K. Lamb | Zendy; E. Kuulkers | Zendy; J. van Paradijs | Zendy; W. H. G. Lewin | Zendy

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The Beat-Frequency Interpretation of Kilohertz Quasi-periodic Oscillations in Neutron Star Low-Mass X-Ray Binaries

Author(s) -

Dimitrios Psaltis,

Mariano Méndez,

R. Wijnands,

J. Homan,

P. G. Jonker,

M. van der Klis,

Frederick K. Lamb,

E. Kuulkers,

J. van Paradijs,

W. H. G. Lewin

Publication year - 1998

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/311455

Subject(s) - neutron star , physics , astrophysics , quasi periodic , beat (acoustics) , x ray , x ray binary , accretion (finance) , oscillation (cell signaling) , low mass , accretion disc , nuclear physics , stars , optics , chemistry , biochemistry

Pairs of quasi-periodic oscillations (QPOs) at kilohertz frequencies are acommon phenomenon in several neutron-star low-mass X-ray binaries. Thefrequency separation of the QPO peaks in the pair appears to be constant inmany sources and directly related to the neutron star spin frequency. However,in Sco X-1 and possibly in 4U 1608-52, the frequency separation of the QPOsdecreases with increasing inferred mass accretion rate. We show that thecurrently available Rossi X-ray Timing Explorer data are consistent with thehypothesis that the frequency separations in all sources vary by amountssimilar to the variation in Sco X-1. We discuss the implications for models ofthe kilohertz QPOs.Comment: 8 pages, 3 b&w figures and 1 color figure; to appear in the Astrophysical Journal Letter

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