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Observations of Cygnus X-2 with IUE: Ultraviolet results from a multiwavelength campaign

Bibcode
1989cxxu.rept...46V
Vrtilek, S. D.; Raymond, J. C.; Garcia, M. R.; Verbunt, F.; Hasinger, Guenther; Kuerster, M.
Bibliographical reference

In Max-Planck-Inst. für Physik und Astrophysik, Observations of Cygnus X-2 at X Ray, UV, Optical and Radio Frequencies p 46-88 (SEE N90-24191 17-89)

Advertised on:
10
1989
Number of authors
6
IAC number of authors
0
Citations
0
Refereed citations
0
Description
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.
Type
Non-refereed
Binary stars
Neutron stars

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