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Abstract: We perform a timing analysis on RXTE data of the accreting millisecond pulsarXTE J1751-305 observed during the April 2002 outburst. After having correctedfor Doppler effects on the pulse phases due to the orbital motion of thesource, we performed a timing analysis on the phase delays, which gives, forthe first time for this source, an estimate of the average spin frequencyderivative = 3.7 +- 1.0E-13 Hz-s. We discuss the torque resultingfrom the spin-up of the neutron star deriving a dynamical estimate of the massaccretion rate and comparing it with the one obtained from X-ray flux.Constraints on the distance to the source are discussed, leading to a lowerlimit of \sim 6.7 kpc.



Autor: A.Papitto 1,2, M.T.Menna 2, L.Burderi 3, T.Di Salvo 4, A.Riggio 3 1 Universita' di Roma Tor Vergata, 2 Osservatorio Astronom

Fuente: https://arxiv.org/







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