The cooling phase of Type I X-ray bursts observed with RXTE in 4U 1820−30 does not follow the canonical F ∝ T4 relation

@article{Garcia2013TheCP,
  title={The cooling phase of Type I X-ray bursts observed with RXTE in 4U 1820−30 does not follow the canonical F ∝ T4 relation},
  author={Federico Garc'ia and Guobao Zhang and Mariano M'endez IAR-CONICET and A. I. Bogomazov 1- Sternberg Astronomical Institute and Groningen and The Netherlands.},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2013},
  volume={429},
  pages={3266-3271}
}
We analysed the complete set of bursts from the neutron star low-mass X-ray binary 4U 1820-30 detected with the Rossi X-ray Timing Explorer (RXTE). We found that all are photospheric radius expansion bursts, and have similar duration, peak flux and fluence. From the analysis of time-resolved spectra during the cooling phase of the bursts, we found that the relation between the bolometric flux and the temperature is very different from the canonical F ∝ T4 relation which is expected if the… 

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