The white dwarf cooling sequence of the globular cluster messier 4

@article{Hansen2002TheWD,
  title={The white dwarf cooling sequence of the globular cluster messier 4},
  author={Brad M S Hansen and James Philip Brewer and Gregory G. Fahlman and Brad K. Gibson and Rodrigo A. Ibata and Marco Limongi and Robert Michael Rich and Harvey B. Richer and Michael M. Shara and Peter B. Stetson},
  journal={The Astrophysical Journal},
  year={2002},
  volume={574}
}
We present the white dwarf sequence of the globular cluster M4, based on a 123 orbit Hubble Space Telescope exposure, with a limiting magnitude of V ~ 30 and I ~ 28. The white dwarf luminosity function rises sharply for I > 25.5, consistent with the behavior expected for a burst population. The white dwarfs of M4 extend to approximately 2.5 mag fainter than the peak of the local Galactic disk white dwarf luminosity function. This demonstrates a clear and significant age difference between the… 

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