The time derivative of the kilohertz quasi-periodic oscillations in 4U 1636−53

@article{Sanna2012TheTD,
  title={The time derivative of the kilohertz quasi-periodic oscillations in 4U 1636−53},
  author={Andrea Sanna and Mariano M{\'e}ndez and Tomaso Belloni and Diego Altamirano Groningen and Inaf-Oab and Amsterdam},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2012},
  volume={424},
  pages={2936-2942}
}
We analysed all archival Rossi X-ray Timing Explorer (RXTE) observations of the neutron star low-mass X-ray binary 4U 1636−53 up to 2010 May. In 528 out of 1280 observations we detected kilohertz quasi-periodic oscillations (kHz QPOs), with ∼65 per cent of these detections corresponding to the so-called lower kHz QPO. Using this QPO we measured, for the first time, the rate at which the QPO frequency changes as a function of QPO frequency. For this we used the spread of the QPO frequency over… Expand

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