Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975nyasa.262..400k&link_type=abstract
(AAS, American Physical Society, and New York Academy of Sciences, Texas Symposium on Relativistic Astrophysics, 7th, Dallas, Te
Astronomy and Astrophysics
Astrophysics
2
Astronomical Models, Binary Stars, X Ray Spectra, X Ray Stars, Astronomical Photometry, Astronomical Spectroscopy, Bremsstrahlung, Emission Spectra, G Stars, Line Spectra, Power Spectra
Scientific paper
Spectroscopic and photometric observations made by the Uhuru satellite have shown that several x-ray sources are binary. Assuming that Sco X-1 and Cyg X-2 are also binary, models are constructed to explain their contrasting spectroscopic and photometric properties. For both Sco X-1 and Cyg X-2, and inclination much less than 90 is necessary to avoid x-ray eclipses and reduce the amplitude of the regular photometric variation. The effective temperature of the coolest part of Sco X-1 is assumed to be about 40,000 K. The large observed ratio of the total optical power to the x-ray power is explained by the large bolometric correction. Because the x-ray spectrum is soft, the x-rays are absorbed above the photosphere, resulting in a reversed temperature gradient in the line-forming region and the observed emission line spectrum. To attain the high value of the coolest part, the binary system must be rather small. The properties of Cyg X-2 may be explained by a model of a G-type star with one side heated by x-ray irradiation to A-type temperature.
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