BATSE observations of 4U1538‐52: A 530 second pulsar

Abstract:

The BATSE experiment on CGRO, a nearly continuous all sky monitor, is capable of detecting and monitoring pulsars in the hard x‐ray/gamma‐ray energy range. Using data processed with a global background subtraction method, we are able to construct pulsed intensity and pulse period histories for the accreting binary x‐ray pulsar 4U1538‐52 in the 20–50 keV energy band. This pulsar, which has a pulse period of approximately 530 seconds, is believed to be a wind accretor with a high mass companion. It was observed by previous experiments to be in secular spin down during the 1976–1988 period. Here we report observing, for the first time, a secular spin up trend. We are able to use this data to improve the upper limit on orbital period changes.

Año de publicación:

1994

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Fuente:

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