Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.288..681h&link_type=abstract
Nature, vol. 288, Dec. 18-25, 1980, p. 681-684. Research supported by the Universitaet Bonn.
Astronomy and Astrophysics
Astronomy
13
Pulsars, Radio Astronomy, Stellar Radiation, Polar Caps, Radio Bursts, Stellar Structure
Scientific paper
The structures of single pulses observed at 430 MHz from the pulsar PSR 1237+25, which are characterized by a five-peaked integrated intensity profile, are analyzed in an attempt to clarify the mechanism of pulsar emission. Examination of over 2,000 consecutive pulses, which have a periodicity approximately 2.8 times the rotation period, leads to an interpretation of the so-called S-bursts in terms of the polar cap model of pulsar emission as representing the intersection of the line of sight with the spiral trajectory of the burst in the magnetosphere. Interruptions in the S-bursts, observed to last for several successive pulses, are attributed to long bursts moving along the magnetic axis, which also may account for the third type of emission pattern observed, designated an abnormal mode.
Hankins Timothy H.
Wright Geoffrey A. E.
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