Abstract
We reported the discovery of a new, third kHz quasi-periodic oscillation (kHz QPO) in the power spectra of three atoll sources. This new kHz QPO is present simultaneously with the previously-known kHz QPO pair. The new kHz QPO is found at a frequency that is 52.8±0.9 Hz, 64±2 Hz, 58.4±1.9 Hz higher than the frequency of the lower kHz QPO in the neutron star low-mass X-ray binaries 4U 1608-52, 4U 1728-34, and 4U 1636-53, respectively.
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