Daily observations of a large period jump of the VELA pulsar

Details Daily observations of a large period jump of the VELA pulsar Daily observations of a large period jump of the VELA pulsar

Mar 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.302..319m&link_type=abstract

Nature, vol. 302, Mar. 24, 1983, p. 319-321.

Computer Science

43

Periodic Variations, Pulsars, Time Response, Neutron Stars, Parameter Identification, Stellar Models

Scientific paper

The decay and recovery of the pulse arrival times of signals from the Vela pulsar PSRO833-45 are analyzed for indications of the structure of the object. A 102 nsec decrease was found to occur over a day's observations at 646 MHz. Six weeks of relatively continuous observations showed that a recovery from the decay occurred. Time constants for an exponential decay were defined as about 1.62 and 233 days, which were summed in a model for the decay processes. A secular increase of 10.7 nsec per day was detected along with the 102.2 nsec decrease on one day. The initial decay proceeded rapidly, a feature which resembles discontinuous changes in the Crab Nebula pulsar signals. Two-component models do not account for the rapid initial decay. A three-component model, with the third component tightly coupled to the neutron star crust, is discussed.

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