Optical spectroscopy of V 1341 Cygni, the optical counterpart of Cygnus X-2

Details Optical spectroscopy of V 1341 Cygni, the optical counterpart of Cygnus X-2 Optical spectroscopy of V 1341 Cygni, the optical counterpart of Cygnus X-2

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...235..156v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 235, no. 1-2, Aug. 1990, p. 156-161.

Astronomy and Astrophysics

Astrophysics

25

Astronomical Spectroscopy, Stellar Spectra, X Ray Binaries, X Ray Spectra, Color-Color Diagram, Cygnus Constellation, Emission Spectra, Stellar Mass Accretion

Scientific paper

Results are reported from spectroscopic observations of the optical counterpart of Cyg X-2, performed using the William Herschel Telescope between June 9 and 27, 1988, as part of an international observing campaign, comprising X-ray, UV, optical, and radio observations. The properties of the emission lines in the optical spectrum show large variations, which do not appear to be correlated with the orbital phase. A comparison with (near-) simultaneous X-ray data shows that the He II 4686-A and the Bowen 4630-A emission lines become stronger as the X-ray source moves from the horizontal branch towards the flaring branch of the Z-shaped track in the X-ray color-color diagram.

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