The Atmospheres and Spectra of X-ray Illuminated Stars:
Line Formation

N. A. Sakhibullin and V. V. Shimanskii

Kazan State University, ul. Lenina 18, Kazan, 420008 Tatarstan, Russia

Received May 28, 1996

Abstract—The formation of lines in X-ray illuminated atmospheres and in close binary systems with X-ray
sources is studied. It is shown that there are three groups of lines: “cool” (absorption lines), “normal” (absorp-
tion lines with emission cores), and “hot” (emission lines). The effect of the parameters of the irradiative X-ray
flux and the observing conditions on the formation of lines of different groups is analyzed. The method of gray
approximation has been found to be applicable to the synthesis of the profiles of cool and normal lines. The
method of constructing synthetic spectra for close binary systems has been developed, and the possibility of
determining the parameters of the systems from an analysis of lines of different groups is shown.

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