Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990s%26t....80..240g&link_type=abstract
Sky and Telescope (ISSN 0037-6604), vol. 80, Sept. 1990, p. 240-244.
Astronomy and Astrophysics
Astronomy
Neutron Stars, Pulsars, Stellar Magnetic Fields, Stellar Rotation, Crab Nebula, Electromagnetic Radiation, Energy Storage, Ionized Gases, Radio Sources (Astronomy)
Scientific paper
The theory concerning pulsars is reviewed, with particular attention to possible evolution, life cycle, and rejuvenation of these bodies. Quantum liquids, such as neutron superfluids, and evidence for the existence of superfluid vortices and other internal phenomena are considered with particular attention to the Crab pulsar. Rate of change of the rotation rate is measured and analyzed for the Crab pulsar and the implications of deviations in the pulse times from those of a perfect rotator are examined. Glitches, the sudden increase in rotation rate of a pulsar that has previously exhibited a steady slowdown, are discussed and it is suggested that the movement of the superfluid core relative to the crust is responsible for this phenomenon. It is noted that radio waves from pulsars can be used to determine the intensity and structure of interplanetary and interstellar gas turbulence and to provide a direct measure of the strength of the interstellar magnetic field.
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