The X-ray spectrum of CYG X-2.
Abstract
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.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- January 1984
- Bibcode:
- 1984A&A...130..175B
- Keywords:
-
- Binary Stars;
- Neutron Stars;
- Stellar Spectra;
- X Ray Sources;
- X Ray Spectra;
- Bremsstrahlung;
- Cygnus Constellation;
- Spectrum Analysis;
- Stellar Models;
- Astrophysics