Model of Cygnus X-2


OBSERVATIONS on the optical object associated with Cyg X-2 (ref. 1) have shown that the system is a spectroscopic binary (for example, ref. 2), with one component a G star3, but the nature of the other component is not obvious. Kraft and Demoulin3 identified the G component from weak but definitely present G-type features, including the λ4226 line of Ca I… (More)
DOI: 10.1038/2231350a0


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