Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.245..514b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 245, NO. 1/JUL1, P. 514, 1990
Astronomy and Astrophysics
Astronomy
103
Scientific paper
We have studied the radio pulsar emission beam assuming a magnetic dipole field geometry, and that the beam geometry is defined by the field lines that are not contained within the light cylinder. In general, the beam is compressed in the meridional direction. When the magnetic and rotation axes are aligned the beam is circular, and, as the angle between these axes increases, the ratio of meridional to longitudinal dimension decreases monotonically to the minimum value 0.62 when the axes are orthogonal. Evidence for this effect is found in the large data set of pulsar emission geometries presented by Lyne & Manchester. The beam evolution was also determined using this data set and the beamwidth was found to be proportional to P-1/2, where P is the pulsar period. This relation implies that the rapidly rotating pulsars should have large beams and this should aid their detection. The more numerous, slower pulsars should have somewhat smaller beams than previously determined. This implies that the pulsar birthrate is probably nearer the highest current estimates (1 in 25 yr).
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