Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...301..901r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 301, Feb. 15, 1986, p. 901-922. Research supported by the Research Corporat
Astronomy and Astrophysics
Astrophysics
143
Pulsars, Stellar Radiation, Pulse Modulation, Pulsed Radiation, Stellar Cores
Scientific paper
The implications of mode changing, drifting subpulses, and pulse nulling in pulsar emission for an empirical model previously developed by the author are discussed. Profile mode changing is studied as a reorganization of core and conal emission, and it is shown that modal changes of the average profile prototypically occur in pulsars having triple or multiple profiles. It is demonstrated that drifting subpulses are associated with conal emission, and that stars which prototypically exhibit the drifting subpulse phenomenon all have conal single profiles wherein the sight line traverses the conal emission lobe tangentially. Finally, it is shown that, within a given profile class, stars which null are no older than those which do not, and the null fraction does not seem to increase with age. Pulsars thus do not null simply by virtue of their age.
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