When SS433 was first noticed in the 1970s it appeared to be no more than a faint red star, except that it showed hydrogen emission lines. These are spectral lines generated by hot hydrogen at the surface of the star, an interesting phenomenon to two astronomers, C. Bruce Stephenson and Nicholas Sanduleak. This star was the 433rd entry in their catalog of such objects.
KeywordsBlack Hole Spectral Line Radio Wave Radio Emission Accretion Disk
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