Abstract
The problem of ionization for magnesium and radiation field in k and h MgII doublet in common envelopes – roundchroms – formed around the RS CVn type systems is examined. It is shown that: a) The roundchroms are completely opaque in the lines of k and h MgII doublet; b) F, G or K type cool stars as secondary in such binaries ensure the complete ionization of magnesium atoms within the whole volume of roundchrom; c) The density of k and h MgII doublet radiation field in the main volume of roundchrom is extremely high, on four-five orders of magnitude, than is derived for its outer boundary. These results have direct relation to the observed saddle-like and very broad shapes of k and h MgII emission lines in the spectrum of RS CVn type close binaries.
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