Observation of a long term spin-up trend in 4U1538-52

Details Observation of a long term spin-up trend in 4U1538-52 Observation of a long term spin-up trend in 4U1538-52

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aipc..410..778r&link_type=abstract

The fourth compton symposium. AIP Conference Proceedings, Volume 410, pp. 778-782 (1997).

Computer Science

Pulsars, X-Ray Binaries, Stellar Rotation, Neutron Stars

Scientific paper

The high mass x-ray pulsar 4U1538-52 has been continually monitored by the BATSE (Burst and Transient Source Experiment) on CGRO (Compton Gamma-ray Observatory). The frequency history reveals that a reversal of the long term trend in the accretion torque, from spinning down to spinning up, has occurred, probably in 1988. This is the first time a long term change is known to have occurred for this source. The magnitude of the average |ν˙/ν|~10-11s-1 over an interval of ~5 years is similar during spin-down and spin-up. Shorter term pulse frequency variations of either sign are also observed. The power density spectrum of fluctuations in angular acceleration is consistent with white noise on timescales from 16 to 1600 days. It can be well fit with a power law with power law index 0.10+/-0.21 and white noise strength (7.6+/-1.6)×10-21(Hz/s)2Hz-1.

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