A 695-Hz quasi-periodic oscillation in the low-mass X-ray binary EXO 0748-676

Abstract

We report the discovery of a 695-Hz quasi-periodic oscillation (QPO) in data taken with the Rossi X-ray Timing Explorer of the low-mass X-ray binary (LMXB) EXO 0748-676. This makes EXO 0748-676 the second dipping LMXB, after 4U 1915-05, that shows kHz QPOs. Comparison with other sources suggests that the QPO corresponds to the lower frequency peak of the kHz QPO pair often observed in other LMXBs. The QPO was found in the only observation done during an outburst of the source in early 1996. This observation is also the only one in which the ~1 Hz QPO recently found in EXO 0748-676 is not present.

6 pages, accepted for publication in Part 1 of The Astrophysical Journal

References in corpus (2)

• Hard X-ray Emission From Low Mass X-ray Binaries
• Discovery of a ~1 Hz quasi-periodic oscillation in the low-mass X-ray binary 4U 1746-37

Cited by in corpus (20)

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• Discovery of the Neutron Star Spin Frequency in EXO 0748-676
• Is there a link between the neutron-star spin and the frequency of the kilohertz quasi-periodic oscillations?
• Quasar Parallax: a Method for Determining Direct Geometrical Distances to Quasars
• Discovery of a 552 Hz burst oscillation in the low-mass X-ray binary EXO 0748-676
• X-Ray Spectroscopy of the Low-Mass X-ray Binaries 2S 0918-549 and 4U1543-624: Evidence for Neon-Rich Degenerate Donors
• XMM-Newton observations of the low-mass X-ray binary EXO 0748-676 in quiescence
• XMM-Newton light curves of the low-mass X-ray binary EXO 0748--676: dips, eclipses, and bursts
• The correlations between the spin frequencies and kHz QPOs of Neutron Stars in LMXBs
• The eclipsing bursting X-ray binary EXO 0748-676 revisited by XMM-Newton
• Measuring Neutron Star Mass and Radius with Three Mass-Radius Relations
• Discovery of millihertz quasi-periodic oscillations in the X-ray binary EXO 0748--676
• The broad-band X-ray spectrum of the dipping Low Mass X-ray Binary EXO0748--676
• Discovery of kilohertz quasi-periodic oscillations and state transitions in the low-mass X-ray binary 1E~1724-3045 (Terzan 2)
• A possible signature of Lense-Thirring precession in dipping and eclipsing neutron-star low-mass X-ray binaries
• High-frequency variability in neutron-star low-mass X-ray binaries
• On the geometric nature of low-frequency quasi-periodic oscillations in neutron-star low-mass X-ray binaries
• The cooling, mass and radius of the neutron star in EXO 0748-676 in quiescence with XMM-Newton
• X-ray and optical orbital modulation of EXO 0748-676: A co-variability study using XMM-Newton