Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...206..273s&link_type=abstract
Astrophysical Journal, vol. 206, May 15, 1976, pt. 1, p. 273-281.
Astronomy and Astrophysics
Astrophysics
8
Magnetic Dipoles, Pair Production, Polar Caps, Pulsars, Radio Emission, Astronomical Models, Electron-Positron Pairs, Field Strength, Gamma Rays, Lines Of Force, Magnetospheres
Scientific paper
The radiation properties of pulsars are reinvestigated in the context of the 'PCFB' model, according to which the radiation originates at the polar caps and the magnetic-field lines change from a closed to an open configuration at the 'force-balance' or 'corotation' radius. Major attention is given to the condition for electron-positron pair creation, which leads, in turn, to an extinction condition whereby any pulsar will cease to be a radio emitter after its period has increased beyond a certain value. This extinction condition is derived on the basis of a model where the magnetic field is the same as that of a point dipole located at the center of the star; effects of dipole distortion are also considered. A comparison of the results with observational data shows that most pulsars satisfy or nearly satisfy the pair-creation condition for undistorted dipoles and seem to satisfy the extinction condition. It is noted that pulsars which should be extinguished according to the undistorted-dipole model need not be if the magnetic field is sufficiently distorted at the polar caps.
Baker Keith
Sturrock Peter Andrew
Turk J. S.
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