The X-ray spectrum of CYG X-2

Details The X-ray spectrum of CYG X-2 The X-ray spectrum of CYG X-2

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...130..175b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 130, no. 1, Jan. 1984, p. 175-178. Research supported by the Consiglio Naziona

Astronomy and Astrophysics

Astrophysics

9

Binary Stars, Neutron Stars, Stellar Spectra, X Ray Sources, X Ray Spectra, Bremsstrahlung, Cygnus Constellation, Spectrum Analysis, Stellar Models

Scientific paper

The spectrum of Cyg X-2, determined by Ariel V Experiment C observations, is best fitted by a thermal bremsstrahlung model only at energies higher than ≡2 keV. At lower energies an excess of flux above the theoretical curve is clearly present and on occasions there is evidence for a feature between 2 and 3 keV: the latter may be indication of a break in a two-component spectrum or an absorption feature of the type expected from X-ray transfer in an optically thick environment. The 2 - 10 keV flux of Cyg X-2 is seen to vary by about a factor of 5 between two Ariel V observations 20 months apart. In the present paper the auhors attempt to interpret these observational results in the context of X-ray reprocessing in a neutron star binary system.

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