Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-07
Astronomy and Astrophysics
Astrophysics
7 pages including 1 figure. Accepted for publication by ApJ; revised version including proof corrections
Scientific paper
10.1086/510659
We performed a timing analysis of the fastest accreting millisecond pulsar IGR J00291+5934 using RXTE data taken during the outburst of December 2004. We corrected the arrival times of all the events for the orbital (Doppler) effects and performed a timing analysis of the resulting phase delays. In this way we have the possibility to study, for the first time in this class of sources, the spin-up of a millisecond pulsar as a consequence of accretion torques during the X-ray outburst. The accretion torque gives us for the first time an independent estimate of the mass accretion rate onto the neutron star, which can be compared with the observed X-ray luminosity. We also report a revised value of the spin period of the pulsar.
Burderi Luciano
D'Antona Francesca
Iaria Rosario
Lavagetto Giuseppe
Menna Maria Teresa
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