Precession instability in SS 433

Details Precession instability in SS 433 Precession instability in SS 433

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...273..697a&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 273, Oct. 15, 1983, p. 697-701. Research supported by the Alfred P. Sloan F

Astronomy and Astrophysics

Astrophysics

27

Binary Stars, Precession, Rotary Stability, Stellar Rotation, Stellar Spectrophotometry, X Ray Stars, Axes Of Rotation, Doppler Effect, Emission Spectra, Line Spectra, Stellar Mass Accretion, Stellar Models

Scientific paper

Using four years of Doppler shift observations of the moving emission lines of SS433, the authors present strong evidence for an instability in the 160d (disk precessional) clock. The phase residual and least-squares analyses are consistent with (1) deterministic models which allow for either a constant second time derivative of the precessional frequency, or a sinusoidally modulated precessional frequency, and (2) stochastic fluctuations. Comparison of the present results for SS433 with the previously known instability in the 35d precessional clock of Hercules X-1 shows that the instability in SS433 is not unprecedented, nor even of remarkably large amplitude. The close resemblance of the Her X-1 and SS433 clock instabilities is further support for the presence of precessing accretion disks in both systems.

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