We report a temporal analysis of the millisecond X-ray Pulsar SAX J1808.4-3658 during the 2000 outburst, observed with RXTE. The observed maximum luminosity was approximately a factor of ten lower than in the other outbursts exhibited by the source, and this low flux level forced us to use a technique based on the χ2 obtained with an epoch folding search to discriminate between different possible orbital solutions, in order to correct the data for the orbital motion. In the subsequent searches for periodicities we clearly detected the 401Hz pulsation in at least two observations, but in the faintest the pulsed fraction varied from 20 % ca. to the absence of signs of coherent pulsation at all, while the measured flux remained at an almost constat level. This erratic behaviour is discussed in the context of the centrifugal inhibition of accretion.

A PAPITTO, L BURDERI, DI SALVO T, M T MENNA, L STELLA (2005). Temporal Analysis of the Millisecond X-ray Pulsar SAX J1808.4-3658 During the 2000 Outburst. In INTERACTING BINARIES: Accretion, Evolution, and Outcomes (pp.110-115) [10.1063/1.2130222].

Temporal Analysis of the Millisecond X-ray Pulsar SAX J1808.4-3658 During the 2000 Outburst

DI SALVO, Tiziana;
2005-01-01

Abstract

We report a temporal analysis of the millisecond X-ray Pulsar SAX J1808.4-3658 during the 2000 outburst, observed with RXTE. The observed maximum luminosity was approximately a factor of ten lower than in the other outbursts exhibited by the source, and this low flux level forced us to use a technique based on the χ2 obtained with an epoch folding search to discriminate between different possible orbital solutions, in order to correct the data for the orbital motion. In the subsequent searches for periodicities we clearly detected the 401Hz pulsation in at least two observations, but in the faintest the pulsed fraction varied from 20 % ca. to the absence of signs of coherent pulsation at all, while the measured flux remained at an almost constat level. This erratic behaviour is discussed in the context of the centrifugal inhibition of accretion.
INTERACTING BINARIES: Accretion, Evolution, and Outcomes
Cefalu, ITALY
July 4-10, 2004
2005
6
A stampa
https://aip.scitation.org/doi/10.1063/1.2130222
Published by AIP Conference Proceedings, eds. L. Burderi, L. A. Antonelli, F. D'Antona, T. Di Salvo, G.L. Israel, L. Piersanti, O. Straniero, A. Tornambe
A PAPITTO, L BURDERI, DI SALVO T, M T MENNA, L STELLA (2005). Temporal Analysis of the Millisecond X-ray Pulsar SAX J1808.4-3658 During the 2000 Outburst. In INTERACTING BINARIES: Accretion, Evolution, and Outcomes (pp.110-115) [10.1063/1.2130222].
Proceedings (atti dei congressi)
A PAPITTO; L BURDERI; DI SALVO T; M T MENNA; L STELLA
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/19761
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