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Title:
The long-term timing of SAX J1808.4-3658
Authors:
Hartman, J. M.
Affiliation:
Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of TechnologyJacob.Hartmanatnrl.navy.mil Jacob.Hartmanatnrl.navy.mil
Publication:
A DECADE OF ACCRETING MILLISECOND X-RAY PULSARS. AIP Conference Proceedings, Volume 1068, pp. 38-42 (2008). (AIPC Homepage)
Publication Date:
10/2008
Origin:
AIP
PACS Keywords:
Pulsars, Neutron stars, X-ray binaries, Electric and magnetic moments, polarizability
DOI:
10.1063/1.3031201
Bibliographic Code:
2008AIPC.1068...38H

Abstract

We present a comprehensive timing study of the 2.5 ms pulsar SAX J1808.4-3658, a soft X-ray transient with a recurrence time of roughly 2 years. Using data from the Rossi X-ray Timing Explorer, we construct a phase-connected pulse timing solution for each of four observed outbursts during 1998-2005. We measure a long-term spin down with better than 6σ confidence. The rate is (-5.6+/-2.0)×10-16 Hz s-1, with most of the change occurring during quiescence, and most likely is due to the magnetic dipole torques from a B = 1.5×108 G field. We also find that the 2 hr binary orbital period is increasing at a rate of (3.5+/-0.2)×10-12 s s-1, although it is unclear whether this change reflects secular evolution or short-term variability.
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