Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-08-16
Mon.Not.Roy.Astron.Soc. 326 (2001) 643
Astronomy and Astrophysics
Astrophysics
5 pages, 4 figures. Submitted to the black hole at MNRAS
Scientific paper
10.1046/j.1365-8711.2001.04615.x
We report here on multifrequency radio observations of the pulsed emission from PSR B1259-63 around the time of the closest approach to its B2e companion star. There was a general increase in the pulsar's dispersion measure and scatter broadening, and a decrease in the flux density towards periastron although changes in these parameters were seen on timescales as short as minutes. The pulsed emission disappeared 16 days prior to periastron and remained undetectable until 16 days after periastron. The observations are used to determine the parameters of the wind from the Be star. We show that a simple model, in which the wind density varies with radius as r^-2, provides a good fit to the data. The wind is clumpy with size scales <= 10^10 cm, densities of 10^6 cm^-3 and a velocity of 2000 km/s at a distance of 20 - 50 stellar radii. We find a correlation between dispersion measure variations and the pulse scattering times, suggesting that the same electrons are responsible for both effects.
Johnston Simon
Lyne Andrew G.
Manchester Richard N.
Nicastro Luciano
Wex Norbert
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