Enormous periodic Doppler shifts in SS 433

Details Enormous periodic Doppler shifts in SS 433 Enormous periodic Doppler shifts in SS 433

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233l..63m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 233, Oct. 15, 1979, p. L63-L68.

Astronomy and Astrophysics

Astronomy

92

Astronomical Spectroscopy, Doppler Effect, Radio Sources (Astronomy), Red Shift, Stellar Motions, Variable Stars, Balmer Series, Emission Spectra, Helium, Infrared Spectra, Periodic Variations, Sine Waves, Spectrum Analysis, Symmetry

Scientific paper

Extensive spectroscopic observations of the weird emission-line object SS 433 are presented which show unambiguously that the bizarre 'moving' spectral features are Doppler-shifted Balmer and He I emissions that display unprecedented velocities (up to 50,000 km/s of redshift and -35,000 km/s of blueshift) and enormous changes in velocity (30,000 km/s in 40 days). The spectroscopy indicates that there are two sets of Balmer and He I lines, one with a large and changing redshift and the other with a large and changing blueshift. Doppler shifts for 80 nights are obtained which reveal that the velocity variations are cyclical, repeating in both the blueshift and the redshift systems with a period of about 164 days, that the two systems are always symmetric about a redshift z = 0.04, and that the two systems follow roughly sinusoidal velocity curves. Some strange and interesting short-term spectroscopic features are also discussed, including an IR feature and a red feature that were observed to move simultaneously in opposite directions ('coming and going at the same time').

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