Abstract
Burbidge, Lynds and Stockton1 and Kristian, Sandage and Westphal2 have shown that the point X-ray source Cyg X-2 is very probably binary. Kraft and Demoulin3 further suggest that a third object may be present, for their radial velocity observations do not seem to repeat, but the observational uncertainties are such that this possibility will not be considered here.
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References
Burbidge, E. M., Lynds, C. R., and Stockton, A. N., Astrophys. J., 150, L95, (1967).
Kristian, J., Sandage, A., and Westphal, J. A., Astrophys J., 150, L99, (1967).
Kraft, R. P., and Demoulin, M. H., Astrophys. J., 150, L 183, (1967).
Gursky, H., Gorenstein, P., and Giacconi, R., Astrophys. J., 150, L75, (1967).
Cameron, A. G. W., and Mock, M., Nature, 215, 464 (1967).
Payne-Gaposchkin, C., The galatic Novae (North-Holland Publishing Company, Amsterdam, 1957).
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SOFIA, S., WILSON, R. Population Type of Cygnus X-2. Nature 218, 73–74 (1968). https://doi.org/10.1038/218073b0
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DOI: https://doi.org/10.1038/218073b0
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