Measuring the spin up of the Accreting Millisecond Pulsar XTE J1751-305
- Authors: PAPITTO, A; MENNA, M T; BURDERI, L; DI SALVO, T; RIGGIO, A
- Publication year: 2008
- Type: Articolo in rivista (Articolo in rivista)
- Key words: pulsars: general , pulsars: individual: XTE J1751-305 , stars: magnetic fields , stars: neutron , X-rays: binaries
- OA Link: http://hdl.handle.net/10447/45197
Abstract
We perform a timing analysis on RXTE data of the accreting millisecond pulsar XTE J1751-305 observed during the 2002 April 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 . 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 ~6.7kpc.