Nodding motions of accretion rings and disks - A short-term period in SS 433

Details Nodding motions of accretion rings and disks - A short-term period in SS 433 Nodding motions of accretion rings and disks - A short-term period in SS 433

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..780k&link_type=abstract

Astrophysical Journal, Part 1, vol. 260, Sept. 15, 1982, p. 780-793. Research supported by the Alfred P. Sloan Foundation and N

Astronomy and Astrophysics

Astrophysics

110

Accretion Disks, Binary Stars, Nutation, Orbital Elements, Precession, X Ray Sources, Doppler Effect, Kinematic Equations, Power Spectra, Stellar Gravitation, Stellar Mass Accretion, Stellar Motions, Stellar Spectra, Torque, X Ray Stars

Scientific paper

It is pointed out that accretion disks and rings in mass transfer binaries have been observed spectroscopically and calculated theoretically for many years. The present investigation is partly based on the availability of several years of spectroscopic observations of the Doppler shifts of the moving lines in SS433. A formalism is presented to compute frequencies and amplitudes of short-term 'nodding' motions in precessing accretion disks in close binary systems. This formalism is applied to an analysis of the moving-line Doppler shifts in SS433. The 35d X-ray cycle of Hercules X-1 is also discussed. In the considered model, the companion star exerts a gravitational torque on the disk rim. Averaged over the binary orbit, this yields a steady torque which results in the mean driven counterprecession of the disk.

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