Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978amsci..66..332h&link_type=abstract
American Scientist, vol. 66, May-June 1978, p. 332-339.
Astronomy and Astrophysics
Astrophysics
Astrophysics, Neutron Stars, Pulsars, Radio Astronomy, Stellar Rotation, Astrometry, Periodic Variations, Radiant Flux Density, Stellar Evolution, Stellar Models, Time Dependence
Scientific paper
The variation of radiation intensity was one of the first characteristics of pulsar emission to be studied. Modulation of the pulsar signal has been observed on all time scales ranging from 10 microseconds to several years. Rotation periods range from 33 msec for the young pulsar in the Crab Nebula to 3.7 sec, with most sources having periods in the range from 0.5 to 1.0 sec. The emission is typically confined to a small fraction of the rotation period. Perhaps the most remarkable characteristic of pulsars is the regularity of the interval between pulses. Nearly 90 of the 150 known pulsars have been studied to determine whether or not their periods are changing. In every case, a period increase has been found, though it is typically only about 0.3 nsec per day and in one case just 0.14 nsec per day. By assuming that pulsars are born near the galactic plane, measurements of the source's velocity along with its distance from the plane yields an estimate for the pulsars age.
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