Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983aipc..101..113f&link_type=abstract
IN: Positron-electron pairs in astrophysics; Proceedings of the Workshop, Greenbelt, MD, January 6-8, 1983 (A85-31276 13-90). Ne
Astronomy and Astrophysics
Astrophysics
3
Pulsars, Stellar Radiation, Drift Rate, Electron-Positron Pairs, Pair Production, Phase Shift, Stellar Models
Scientific paper
The manner in which nulls affect the drifting subpulses of PSR 0809+74 has been investigated. Immediately following a null, subpulses reappear at approximately the longitudes expected for subpulses in the first nulled pulse, as previously reported. The higher quality of the new data, however, has made it possible to demonstrate that the 'phase memory' is not perfect; there is a small systematic phase shift in the direction of normal drift. This result is probably inconsistent with the hypothesis that during a null, electron-positron pair production in the polar gap is absent and local 'hot spots' identify the regions over which discharges last occurred. If nulling is the manifestation of temporally steady discharge within discrete regions in the polar gap, on the other hand, a slight phase shift is expected, but the observations do not confirm the prediction that its magnitude should be proportional to null length. In addition, this scenario has difficulty explaining the absormally slow subpulse drift following long nulls and the absence of radio radiation during nulls associated with large phase shifts.
Ewing Martin S.
Filippenko Alexei V.
Readhead Anthony C. S.
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