Abstract
THE star HD 226868 is coincident, within a 3″ error, with a faint and possibly variable radio source which itself is coincident, though with a large uncertainty, with the Cygnus X-1 pulsating X-ray star1.
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MURDIN, P., WEBSTER, B. Optical Identification of Cygnus X-1. Nature 233, 110 (1971). https://doi.org/10.1038/233110a0
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DOI: https://doi.org/10.1038/233110a0
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