Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981prir........19k&link_type=abstract
Priroda, Dec. 1981, p. 19-23. In Russian.
Astronomy and Astrophysics
Astronomy
Binary Stars, Emission Spectra, Stellar Evolution, Wolf-Rayet Stars, Black Holes (Astronomy), Helium, Hydrogen, Line Spectra, Milky Way Galaxy, Neutron Stars, O Stars, Radio Spectra, Red Shift, Spectral Line Width, Stellar Mass Accretion, Stellar Mass Ejection, X Ray Spectra
Scientific paper
The spectral characteristics and probable nature of the emission line object SS 433 are discussed. The object is termed unique as a result of observations of narrow hydrogen and helium emission lines present simultaneously at different red and blue shifts which vary in wavelength with a period of 164 days. The variation in line shifts can be explained by the Doppler effect on emissions from two gas clouds moving with a velocity of about 0.27 c in opposite directions along a straight line at an angle to the line of sight that varies with a period of 164 days. Radio and X-ray observations of radio arms associated with the object indicate its persistence for at least 400 years, while spectroscopic and photometric observations in the visible and infrared have revealed the close binary nature of the source, which may consist of an Of or Wolf-Rayet star undergoing mass transfer with a neutron star or black hole, with the accretion powering the gas streams. The major problem in the understanding of SS 433 remains the generation of the radio arms, which is also important to the understanding of analogous structures in quasars.
Kolykhalov P. I.
Liubarskii Iu. E.
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