Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972ap%26ss..19...47i&link_type=abstract
Astrophysics and Space Science, Vol. 19, p.47
Astronomy and Astrophysics
Astrophysics
1
Scientific paper
In the external layers of supermassive stars and thermal sources of X-ray radiation electron scattering contributes more to the opacity than free-free processes. Therefore, the thermal radiation spectrum of supermassive stars must greatly differ from Planckian. The approximate formulae ob- tained for the radiation spectra are applicable to any objects with a predominant role of electron scattering in the opacity and power dependence of plasma temperature and density on geometrical depth of the layers. In thermal radiation sources with power dependence of plasma temperature on depth of the layer the formation of power radiation spectra F(v) v~ with cx> 0 is possible. Such spectra can imitate the presence of non-thermal radiation mechanisms. This effect takes place also in the case of small optical depth on the Thomson scattering. Possibly, this effect is of interest for the theories of X-ray sources and X-ray solar flares
Illarionov Andrei F.
Sunyaev Rashid A.
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