Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pazh...12..205s&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 12, Mar. 1986, p. 205-211) Soviet Astronomy Letters (ISSN 0360-0327), vol. 12, Mar.-Apr
Astronomy and Astrophysics
Astronomy
Binary Stars, Line Spectra, Periodic Variations, Radial Velocity, Relativistic Velocity, Spectrum Analysis, Accretion Disks, Fourier Analysis, Nutation
Scientific paper
Using the results of spectral observations of the object SS433 by the 6-meter telescope in combination with published data the nutation and precession periods of this system in 1980 - 1982 are specified by means of Fourier analysis. They appeared to be Pn = 6d.284±0d.001 and Pp = 163d.34±0d.05, respectively. During this time in the nutation variations of the disk the components with periods of 6d.384±0d.005, 5d.84±0d.01 and others were also present. It is suspected that the variation of the nutation period at time intervals of several months is discrete. The analysis of the results on determination of the precession period at shorter intervals of time (of the order of one period) has shown that precession instability is nonmonotonous. Secular variations of the precession period are absent.
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