Abstract
Six X-ray sources have been found which show a periodic variability in their X-ray flux which may indicate orbital motion of a binary system1.
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DE FREITAS PACHECO, J. Model for the binary X-ray source 2U1700-37. Nature 249, 637–638 (1974). https://doi.org/10.1038/249637a0
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DOI: https://doi.org/10.1038/249637a0
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