Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.301..313a&link_type=abstract
Nature, vol. 301, Jan. 27, 1983, p. 313, 314.
Astronomy and Astrophysics
Astronomy
44
Pulsars, Radio Sources (Astronomy), Crab Nebula, Electromagnetic Pulses, Error Analysis, Magnetic Moments, Orbital Elements, Stellar Evolution, Stellar Rotation
Scientific paper
A total of 60 hr of 1667 MHz radio observations were made of the period of the pulsar PSR 1937+21. A total of over a billion pulses were detected, and the first phase was traced to a temporal accuracy of 3% of the period. A discussion of the methods employed to account for statistical error in the measurements, particularly in determining the ascension and the declination, is presented. The pulsar was found to have a period of 1.55 msec, with a rate of change in the period of about 1.7 x 10 to the -19th. The pulse profile is similar to that of the pulsar. An angle of 90 deg was found to exist between the position angle of polarization main pulse and the interpulse. A dispersion measurement of nearly 70.5 pc/cu cm indicated a 2 pc distance. The rotational energy exceeds that of the Crab pulsar by a factor of 400, while the slowdown rate is two orders of magnitude lower.
Ashworth M.
Graham Smith F.
Lyne Andrew G.
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