view Abstract Citations (134) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Enormous periodic Doppler shifts in SS433. Margon, B. ; Ford, H. C. ; Grandi, S. A. ; Stone, R. P. S. Abstract 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'). Publication: The Astrophysical Journal Pub Date: October 1979 DOI: 10.1086/183077 Bibcode: 1979ApJ...233L..63M Keywords: 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; Astrophysics; Emission-Line Objects:Periods; Emission-Line Objects:Spectrum Variables; SS433 full text sources ADS | data products SIMBAD (1)
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Margon et al. (1979) studied this question.