Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...20511109r&link_type=abstract
American Astronomical Society Meeting 205, #111.09; Bulletin of the American Astronomical Society, Vol. 36, p.1539
Astronomy and Astrophysics
Astronomy
Scientific paper
Pulsar B0943+10 is well known for its `B' mode, characterized by accurately drifting subpulses, in contrast to its chaotic `Q' mode. Six new Arecibo observations using nearly the full 2+ hours available have shed considerable light on the modal dynamics in this pulsar. Of these, three were found to be exclusively `B' mode, and three were discovered to exhibit transitions from the `Q' to the `B' mode. One of these observations has permitted us to determine the circulation time of the subbeam ``carousel'' in the `Q' mode for the first time, at some 35.5 stellar rotation periods. The onset of the `B' mode is then observed to commence similarly in all three observations. The initial circular time is around 35.5 periods and relaxes to perhaps 38 periods in an near exponential [1-exp (-t/τ )] fashion with a characteristic time of some 54 minutes. Moreover, just after the `B'-mode onset the pulsar exhibits a resolved double profile form with a somewhat larger trailing component, but this trailing component slowly dies away leaving the usual single `B'-mode profile with the longitude of the magnetic axis falling at about its trailing half power point. Additional longer observations are still needed to learn how long `B'-mode sequences can persist and what factors determine how the modal alternation occurs.
Portions of this work were carried out with support from NSF Grants AST 99-87654 and 00-98685. Arecibo Observatory is operated by Cornell University under contract to the US NSF.
Rankin Joanna M.
Suleymanova Svetlana A.
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