Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-05-15
Astronomy and Astrophysics
Astrophysics
5 pages, Latex with AASTEX. Accepted for publication in ApJ
Scientific paper
10.1086/309492
A new technique has been developed to remove the ionosphere's distorting effects from low frequency VLBI data. By fitting dispersive and non-dispersive components to the phases of multi-frequency data, the ionosphere can be effectively removed from the data without the use of {\em a priori} calibration information. This technique, along with the new gating capability of the VLBA correlator, was used to perform accurate astrometry on pulsar B0950+08, resulting in a much improved measurement of this pulsar's proper motion ($\mu_{\alpha} = -1.6 \pm 0.4$ mas/yr, $\mu_{\delta} = 29.5 \pm 0.5$ mas/yr) and parallax ($\pi = 3.6 \pm 0.3$ mas). This puts the pulsar at a distance of $280 \pm 25$ parsecs, about twice as far as previous estimates, but in good agreement with models of the electron density in the local bubble.
Beasley Anthony J.
Benson John M.
Brisken Walter Frank
Fomalont Edward B.
Goss William Miller
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