Optical spectroscopy of V1341 Cyg, the optical counterpart of CYG X-2

Details Optical spectroscopy of V1341 Cyg, the optical counterpart of CYG X-2 Optical spectroscopy of V1341 Cyg, the optical counterpart of CYG X-2

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989cxxu.rept...89v&link_type=abstract

In Max-Planck-Inst. für Physik und Astrophysik, Observations of Cygnus X-2 at X Ray, UV, Optical and Radio Frequencies p 89-102

Astronomy and Astrophysics

Astrophysics

Binary Stars, Ultraviolet Spectra, Visible Spectrum, X Ray Stars, Color-Color Diagram, Cygnus Constellation, Satellite Imagery, Stellar Mass Accretion, X Ray Spectra

Scientific paper

The results of spectroscopic observations of the optical conterpart of Cyg X-2 are presented. They were performed using the William Herschel Telescope between June 9 and 27, 1988, comprising x ray, ultraviolet, 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 the HeII lambda 4686 and the Bowen lambda 4630 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. The possible implications of this result are discussed.

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