Measuring the spin up of the Accreting Millisecond Pulsar XTE J1751-305

Details Measuring the spin up of the Accreting Millisecond Pulsar XTE J1751-305 Measuring the spin up of the Accreting Millisecond Pulsar XTE J1751-305

2007-10-05

arxiv.org/abs/0710.1215v1

Astronomy and Astrophysics

Astrophysics

7 pages, 3 figures, Accepted for publication by MNRAS

Scientific paper

10.1111/j.1365-2966.2007.12551.x

We perform a timing analysis on RXTE data of the accreting millisecond pulsar XTE J1751-305 observed during the April 2002 outburst. After having corrected for Doppler effects on the pulse phases due to the orbital motion of the source, we performed a timing analysis on the phase delays, which gives, for the first time for this source, an estimate of the average spin frequency derivative = (3.7 +/- 1.0)E-13 Hz/s. We discuss the torque resulting from the spin-up of the neutron star deriving a dynamical estimate of the mass accretion rate and comparing it with the one obtained from X-ray flux. Constraints on the distance to the source are discussed, leading to a lower limit of \sim 6.7 kpc.

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