JPL pulsar timing observations - Spinups in PSR 0525+21

Details JPL pulsar timing observations - Spinups in PSR 0525+21 JPL pulsar timing observations - Spinups in PSR 0525+21

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...257l..67d&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 257, June 15, 1982, p. L67-L70.

Computer Science

Numerical Analysis

35

Neutron Stars, Pulsars, Stellar Rotation, Stellar Structure, Angular Momentum, Numerical Analysis, Radio Sources (Astronomy), Starquakes, Stellar Models

Scientific paper

Observations of the very slow objects PSR 0525+21, in which two small spin-ups occur, are presented. Twelve years of observation at 2.4 GHz reveal that the ratio of small jumps to the period is about one billionth, where the period is about 3.745 s; the analysis that arrived at these results is shown. The short-term behavior following the larger jump suggests an exponential decay, and long-term changes in the period derivative of about 0.03 percent clearly persist after each jump. It is argued that the spin-ups are not due to starquakes, but may be caused by uncoupling of a lighter crust from the core.

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