Physics
Scientific paper
Jan 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974natur.247..139b&link_type=abstract
Nature, Volume 247, Issue 5437, pp. 139 (1974).
Physics
5
Scientific paper
THE X-ray source Cyg X-2 has been optically identified with a fifteenth magnitude blue object1. Initial spectroscopic observations2-4 revealed the presence of broad Balmer absorption lines, a narrow, strong Ca II K line and a narrow emission line of He II λ4,686. Radial velocity variations were evident, with the indication that the emission and absorption line velocities varied 180° out of phase. Photometric monitoring4 showed the object to vary erratically on a time scale of minutes. Later spectroscopic observations5,6 confirmed the changes in radial velocity, but no certain evidence of binary motion could be demonstrated. A more recent spectroscopic observation7 showed the He II emission to have developed a P-Cygni profile, and emission at λλ4,640-50 due to C III-N III was present. I report here the results of additional spectroscopic observations of this object.
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