Roundchrom emissivity in close binary systems

Roundchrom is a common chromosphere enveloping both components of close binary system. In present article, the problem of the construction of outward boundary of the roundchrom is examined, particularly, identifying this boundary with zero-velocity equipotential Lagrangian surface corresponding to a definite value of Jacoby constantC. The roundchroms for seven RS CVn type close binary systems as well for an interacting binary HD 207739 are constructed. The main parameters of these roundchroms are obtained, particularly, the electron concentrations are of the order of 10¹⁰ cm^–3.