We present here 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 find a clear parabolic trend of the pulse phase delays showing that the pulsar is spinning up 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 L, DI SALVO T, RIGGIO A, MENNA M T, LAVAGETTO G, PAPITTO A, et al. (2006). Timing an Accreting Millisecond Pulsar: Measuring the Accretion Torque in IGR J00291+5934. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS, 6, 192-196 [10.1088/1009-9271/6/S1/25].

Timing an Accreting Millisecond Pulsar: Measuring the Accretion Torque in IGR J00291+5934

DI SALVO, Tiziana;LAVAGETTO, Giuseppe;IARIA, Rosario;ROBBA, Natale;
2006-01-01

Abstract

We present here 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 find a clear parabolic trend of the pulse phase delays showing that the pulsar is spinning up 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.
2006
BURDERI L, DI SALVO T, RIGGIO A, MENNA M T, LAVAGETTO G, PAPITTO A, et al. (2006). Timing an Accreting Millisecond Pulsar: Measuring the Accretion Torque in IGR J00291+5934. CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS, 6, 192-196 [10.1088/1009-9271/6/S1/25].
File in questo prodotto:
File Dimensione Formato  
2006ChJAS___6a_192B.pdf

accesso aperto

Dimensione 642.88 kB
Formato Adobe PDF
642.88 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/1349
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 1
  • ???jsp.display-item.citation.isi??? 2
social impact