Coupling Between Periodic and Aperiodic Variability in SAX J1808.4-3658

Details Coupling Between Periodic and Aperiodic Variability in SAX J1808.4-3658 Coupling Between Periodic and Aperiodic Variability in SAX J1808.4-3658

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cnoc.conf...30m&link_type=abstract

The Second National Conference on Astrophysics of Compact Objects, held in Bologna (Italy), September 19 - 21, 2001, p. 30

Astronomy and Astrophysics

Astrophysics

Scientific paper

We detect a significant broadening in the wings of the 401 Hz peak in the power spectrum of the accreting millisecond binary pulsar SAX J1808.4-3658. This feature is consistent with the convolution of the red noise present in the power spectrum with the harmonic line. We conclude that the aperiodic variability (associated with the red noise) is modulated at the spin period, clearly indicating that it originates at the magnetic caps close to the neutron star surface. This is analogous to the results found in some longer period, higher magnetic field pulsators in high mass X-ray binaries.

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