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Twenty years of timing ss433

Jul, 2001
21 pages
Published in:
  • Astrophys.J. 561 (2001) 1027
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Abstract: (arXiv)
We present observations of the optical ``moving lines'' in spectra of the Galactic relativistic jet source SS433 spread over a twenty year baseline from 1979 to 1999. The red/blue-shifts of the lines reveal the apparent precession of the jet axis in SS433, and we present a new determination of the precession parameters based on these data. We investigate the amplitude and nature of time- and phase-dependent deviations from the kinematic model for the jet precession, including an upper limit on any precessional period derivative of P˙<5×10−5\dot P < 5 \times 10^{-5}. We also dicuss the implications of these results for the origins of the relativistic jets in SS433.