Fine Orbital Parameters and Soft Phase Lags of Accretion Powered Millisecond Pulsar XTE J1814-338

Details Fine Orbital Parameters and Soft Phase Lags of Accretion Powered Millisecond Pulsar XTE J1814-338 Fine Orbital Parameters and Soft Phase Lags of Accretion Powered Millisecond Pulsar XTE J1814-338

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.0403c&link_type=abstract

American Astronomical Society Meeting 208, #4.03; Bulletin of the American Astronomical Society, Vol. 38, p.81

Astronomy and Astrophysics

Astronomy

Scientific paper

The accretion-powered millisecond pulsar XTE J1814-338 was discovered by Rossi X-ray Timing Explorer (RXTE) in June 2003. To investigate its orbital properties and the accretion torque on the neutron star, we carried out pulse arrival-time analysis, based on the non-burst events within energy range 2-10 keV for the 30d RXTE follow-up observations. We first corrected the event arrival times to the binary barycentre using preliminary circular orbital parameters yielded by Doppler effect, and the residual pulse phases were fitted to compute differential corrections of the orbital parameters, as well as the neutron star spin frequency. We derive that the pulsar has a barycentric pulsar period 3.18110573410(6) ms, orbital period 4.27464551(7) hr, and 390.626(2) lt-ms projected radius. Our analysis of pulsar phase evolution in the initial 23 days shows that the pulsar frequency has a first derivative of -(8.0±0.1)×10-13 Hz s-1, and a second derivative of (5.3±0.1)×10-19 Hz s-2. After applying the fine orbital parameters and removing pulsar phase evolution effects, we were able to find the pulses show energy-dependant phase delay, where soft energy pulses lag high energy pulses for up to 40 microseconds.

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