Title:	Evidence for evolving elongated pulsar beams
Authors:	Narayan, R. Vivekanand, M.
Keywords:	Linear polarization Magnetic poles Polarization characteristics Pulsars Stellar evolution Beams(radiation) Elongation Milky way galaxy Periodic variations Polar caps Stellar models
Issue Date:	Jun-1983
Publisher:	Springer-Verlag
Citation:	Astronomy and Astrophysics, 1983, Vol.122, p45-53.
Abstract:	The total change in the position angle of the linear polarization in 16 pulsars is analyzed (assuming the Radhakrishnan-Cooke (1969) magnetic pole model of pulsar radiation), on the basis of Backer and Rankin's (1980) observational data. The pulsar beams are on the average highly elongated, with the ratio R of the North-South to East-West dimensions being 3.0 + or - 0.4. The R estimate further increases if one allows for reasonable selection effects. The evolution of R with pulsar period P naturally accounts for the P dependence of interpulse occurrence. The evolution of the pulsar beaming fraction f with P renders more certain the recent observation of a deficit of short P pulsars in the Galaxy. Current pulsar electrodynamics and radio beam theories may have to be revised to account for the present results.
URI:	http://hdl.handle.net/2289/1602
ISSN:	0004-6361
Alternative Location:	http://adsabs.harvard.edu/cgi-bin/bib_query?1983A&A...122...45N
Copyright:	(1983) by the European Southern Observatory. Scanned images provided by the NASA ADS.
Appears in Collections:	Research Papers (A&A)

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