The roundchroms of contact binaries

Abstract

It is shown that the formation of a roundchrom, i.e. a common chromosphere,in W UMa type contact binaries is inevitable. The geometrical forms of roundchroms for ten contact binaries are obtained. For contact binaries the round-chroms of open type are predicted along with a possibility of outflow of round-chrom's gaseous matter from the outer Lagrangian point L2. The main parameters of roundchroms, the electron concentration ne, efficient emission volume V, power of emission in magnesium doublet 2800 MgII etc. are obtained for the ten contact binaries. The decrease of the mean electron concentration in roundchrom ne with the increase of the intercomponent distance a is discovered: ne∼ a-1.