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Query: journal id: "astrophysicalxjournal"

AuthorsJ.M. Hartman, A. Patruno, D. Chakrabarty, C.B. Markwardt, E.H. Morgan, M. van der Klis, R. Wijnands
TitleA decade of timing an accretion-powered millisecond pulsar: the continuing spin down and orbital evolution of SAX J1808.4–3658
JournalAstrophysical Journal
FacultyFaculty of Science
Institute/dept.FNWI: Astronomical Institute Anton Pannekoek (IAP)
AbstractThe 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(-18) Hz s(-1), which is consistent with the previously determined spin derivative. The spin down occurs mostly during quiescence, and is most likely due to the magnetic dipole torque from a B = 1.5 x 10(8) G dipolar field at the neutron star surface. We also find that the 2 hr binary orbital period is increasing at a rate of (3.80 +/- 0.06) x 10(-12) s s(-1), also consistent with previous measurements. It remains uncertain whether this orbital change reflects secular evolution or short-term variability.
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