A DECADE OF TIMING AN ACCRETION-POWERED MILLISECOND PULSAR: THE CONTINUING SPIN DOWN AND ORBITAL EVOLUTION OF SAX J1808.4-3658

@article{Hartman2009ADO,
  title={A DECADE OF TIMING AN ACCRETION-POWERED MILLISECOND PULSAR: THE CONTINUING SPIN DOWN AND ORBITAL EVOLUTION OF SAX J1808.4-3658},
  author={Jacob M. Hartman and Alessandro Patruno and Deepto Chakrabarty and Craig B. Markwardt and Edward H. Morgan and Michiel van der Klis and Rudy Wijnands},
  journal={The Astrophysical Journal},
  year={2009},
  volume={702},
  pages={1673-1678}
}
The Rossi X-ray Timing Explorer has observed five outbursts from the transient 2.5 ms accretion-powered pulsar SAX J1808.4-3658 during 1998-2008. We present a pulse timing study of the most recent outburst and compare it with the previous timing solutions. The spin frequency of the source continues to decrease at a rate of (-5.5 {+-} 1.2) x 10{sup -18} Hz s{sup -1}, which is consistent with the previously determined spin derivative. The spin down occurs mostly during quiescence, and is most… Expand

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