The broad-band X-ray spectrum of Cygnus X-2

Details The broad-band X-ray spectrum of Cygnus X-2 The broad-band X-ray spectrum of Cygnus X-2

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..239p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 1, 1983, p. 239-244.

Astronomy and Astrophysics

Astrophysics

8

Binary Stars, Continuous Spectra, Stellar Models, X Ray Sources, X Ray Spectra, Bremsstrahlung, Cygnus Constellation, High Temperature Plasmas, Hydrogen Clouds, Neutron Stars, Stellar Luminosity, Thermal Radiation, Ultraviolet Spectra

Scientific paper

Cygnus X-2 was observed with the broad-band X-ray spectroscopy experiment, HEAO 1 A-2, in the energy range 0.4-18 keV for four intervals of approximately 31 s over the course of 5 days in 1977. The spectra can be adequately represented by single-temperature thermal bremmstrahlung continua with temperatures ranging from 3.7 x 10 to the 7th K to 6.4 x 10 to the 7th K. An examination of the spectra and the spectra-luminosity relationship effectively rules out one degenerate dwarf model for the X-ray emission. The far-UV continuum emission could be dominated by this continuum component during X-ray high states, an effect which would be detected in optical UV line observations. A Comptonized X-ray cloud around a neutron star remains a viable model for the observed X-ray spectra.

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