The Beat-Frequency Interpretation of Kilohertz QPOs in Neutron Star Low-Mass X-ray Binaries
arXiv:astro-ph/9805084 · doi:10.1086/311455
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 1608-52, the frequency separation of the QPOs 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 frequency 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.
8 pages, 3 b&w figures and 1 color figure; to appear in the Astrophysical Journal Letters
References in corpus (7)
- On the Amplitude of Burst Oscillations in 4U 1636-54: Evidence for Nuclear Powered Pulsars
- Discovery of a second kHz QPO peak in 4U 1608-52
- Milli-second Oscillations in the Persistent and Bursting Flux of Aql X-1 During an Outburst
- KiloHertz Quasi-Periodic Oscillations in GX 17+2
- Discovery of KiloHertz Quasi-Periodic Oscillations in the Z source Cygnus X-2
- Discovery of kilohertz quasi-periodic oscillations in the Z source GX 340+0
- Energy Spectra and High Frequency Oscillations in 4U 0614+091
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