Evidence for Centrifugal Barrier in X-ray Pulsar GRO J1744-28

Details Evidence for Centrifugal Barrier in X-ray Pulsar GRO J1744-28 Evidence for Centrifugal Barrier in X-ray Pulsar GRO J1744-28

1997-12-13

arxiv.org/abs/astro-ph/9712175v1

Astronomy and Astrophysics

Astrophysics

4 pages. To appear in "Accretion Processes in Astrophysical Systems", Proc. of the 8th Annual Astrophysics Conference in Maryl

Scientific paper

10.1063/1.55924

We present further observational evidence of the effects of a centrifugal barrier in GRO J1744-28, based on continued monitoring of the source with RXTE. For X-ray pulsars, the centrifugal barrier manifests itself in the cessation of pulsed emission when the source becomes faint. We show that such phenomenon occurred repeatedly for GRO J1744-28, following the decay of two X-ray outbursts. This has allowed a direct measurement of the dipole field strength for this pulsar. Here we argue that some of the other peculiar properties observed of this source may also be related to an active centrifugal barrier.

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