Abstract
The discovery1 of radio structure on a scale of 10–50 m arc s in SS433 has prompted us to monitor the object with the European VLBI network. The first observations in this programme were made for periods of 9 and 10 h at a wavelength of 6 cm on 9 January (JD2444248) and 1–2 June (JD2444392.5) 1980. Our results, together with the observations of Walker et al.2 at an earlier epoch, show that the compact radio structure of SS433 changes orientation in a manner consistent with the 164-day precession period inferred from the optical emission lines, but with a phase delay of 5 ± 4 days. The shape of the radio structure is elongated, non-linear and changes from one observing epoch to the other.
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Schilizzi, R., Miley, G., Romney, J. et al. Changes in orientation and appearance of the 100 m arc s radio structure in SS433. Nature 290, 318–320 (1981). https://doi.org/10.1038/290318a0
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DOI: https://doi.org/10.1038/290318a0
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