Abstract
The iron K-emission line of Cyg X-2 was detected from the TENMA observation. The centre energy, the equivalent width and the intrinsic line width are 6.7 keV, ∼30 eV, and less than 0.6 keV, respectively. These properties indicate that the observed line is mostly due to helium-like iron and the electron scattering depth of the line emitting region is smaller than three.
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Hirano, T., Hayakawa, S., Nagase, F. et al. Iron K-emission line from Cygnus X-2. Astrophys Space Sci 119, 77–80 (1986). https://doi.org/10.1007/BF00648817
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DOI: https://doi.org/10.1007/BF00648817