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Astron. Astrophys. 321, 519-522 (1997)

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Geometrical effects on radio pulsar profiles and spectra

W. Sieber

Fachhochschule Niederrhein, PF 2850, D-47728 Krefeld, Germany

Received 23 April 1996 / Accepted 10 October 1996


Considering the geometry of the hollow-cone model of radio pulsar emission in detail, one is led to the conclusion that several well-known observed effects may be explained quite easily purely on geometrical terms. It can be shown e.g. that the appearance of outriders at high frequencies and a steepening of the whole spectrum (cut-off) must be expected for certain geometrical situations as well as variations in component spectra, e.g. a steepening of the central (core) component. These effects appear in addition to the presumably also existing physical variations with frequency.

Key words: pulsars: general – radiation mechanisms: general

Send offprint requests to: W. Sieber

© European Southern Observatory (ESO) 1997

Online publication: June 30, 1998