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

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

2000-03-16

arxiv.org/abs/astro-ph/0003241v1

Astronomy and Astrophysics

Astrophysics

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

Scientific paper

10.1086/309280

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.

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