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Title:
Coherent Timing Analysis of Accreting Millisecond Pulsars
Authors:
Burderi, L.; di Salvo, T.; Riggio, A.; Papitto, A.; Menna, M. T.
Affiliation:
AA(Università degli Studi di Cagliari, Dipartimento di Fisica, SP Monserrato-Sestu, KM 0.7, 09042 Monserrato, Italy), AB(Dipartimento di Scienze Fisiche ed Astronomiche, Università di Palermo, via Archirafi 36-90123 Palermo, Italy), AC(Università degli Studi di Cagliari, Dipartimento di Fisica, SP Monserrato-Sestu, KM 0.7, 09042 Monserrato, Italy), AD(Dipartimento di Fisica, Universitá degli Studi di Roma `Tor Vergata', via della Ricerca Scientifica 1, 00133 Roma, Italy; Osservatorio Astronomico di Roma, Via Frascati 33, 00040 Monteporzio Catone (Roma), Italy), AE(Osservatorio Astronomico di Roma, Via Frascati 33, 00040 Monteporzio Catone (Roma), Italy)
Publication:
A DECADE OF ACCRETING MILLISECOND X-RAY PULSARS. AIP Conference Proceedings, Volume 1068, pp. 17-24 (2008). (AIPC Homepage)
Publication Date:
10/2008
Origin:
AIP
PACS Keywords:
Pulsars, Accretion and accretion disks, X-ray binaries
DOI:
10.1063/1.3031190
Bibliographic Code:
2008AIPC.1068...17B

Abstract

We review recent results of our group on X-ray timing of accreting millisecond pulsars in LMXBs. The good quality of the RXTE data allow us to obtain information on the behavior of a very fast pulsar subject to accretion torques. We find both spin-up and spin-down behaviors, from which, using available models for the accretion torques, we derive, in most cases, information on the mass accretion rate and magnetic field strength of the neutron star in these systems. For some sources the phase delays behavior as a function of time is quite complex and difficult to interpret, since abrupt phase shifts are sometime present which are most probably driven by variations of the X-ray flux.
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