Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989cxxu.rept...46v&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 46-88 (
Astronomy and Astrophysics
Astrophysics
Binary Stars, Iue, Stellar Mass Accretion, Stellar Spectra, Ultraviolet Spectra, X Ray Stars, Cygnus Constellation, Neutron Stars, Satellite Imagery, X Ray Spectra
Scientific paper
The observations of the low-mass x ray binary, Cyg X-2, taken with the International Ultraviolet Explorer (IUE) in a campaign conducted in June and October of 1988 are reported. A direct relationship between the strength of the UV continuum and line emission and the placement of the x ray spectrum in one of three branches of the so-called Z-shaped curve is found by comparison with simultaneous x ray observations. All three previously known x ray spectral states are detected; the UV continuum and line emission increase monotonically along the Z with the least emission in the horizontal branch, and the most in the flaring branch. Emission lines due to HeII, CIV, NIII, NIV, NV, SiIV, and MgII are observed.
Garcia Murillo R.
Hasinger Guenther
Kuerster Martin
Raymond John C.
Verbunt Frank
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