Far-ultraviolet observations of Cygnus X-2

Details Far-ultraviolet observations of Cygnus X-2 Far-ultraviolet observations of Cygnus X-2

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241l..23m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 241, Oct. 1, 1980, p. L23-L26.

Astronomy and Astrophysics

Astronomy

11

Binary Stars, Stellar Spectra, Ultraviolet Astronomy, X Ray Sources, Emission Spectra, Iue, Neutron Stars, Ultraviolet Spectra, White Dwarf Stars

Scientific paper

Two far-ultraviolet (1150-1950 A) spectra of V 1341 Cyg identical with Cyg X-2, taken with the International Ultraviolet Explorer, at orbital phase 0.3 and 0.6 show an intensity variation of a factor of 2. Strong emission lines (N V, Si IV, and He II) are apparent on a poorly defined continuum. The observations can be interpreted in terms of UV emission by the X-ray heated atmosphere of the noncollapsed star in the binary system. A neutron star rather than a white dwarf is indicated as the compact companion.

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