In accreting neutron star (NS) low-mass X-ray binaries (LMXBs), the turbulent flow in accretion\ndisk may show magnetic structures. Its emission will vary in time due to inhomogeneous motions\nthrough and with the accretion flow. These emissions contribute to considerable X-ray variability\non a wide range of timescales in all wavelengths, and down to milliseconds. In this article, we give\na brief review for quasi-periodic oscillations (QPOs), one of a periodic X-ray variability, in NS/\nLMXBs. Firstly, we give a brief introduction to NS/LMXBs and the fruitful QPO components. As an\nexample, the energy dependence of normal branch oscillations in Scorpius X-1 is discussed. We\nmostly focus on the properties and mechanism of kilohertz QPOsââ?¬â?the fastest variability components\nthat have the same order as the dynamical timescales of the innermost regions of accretion\nflow. Finally, we discuss the success and questions for theoretical interpretations and present the\npossible entry for investigation of nature of QPOs.
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