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We present results of numerical modeling of the cyclic brightness modulationin the young binary systems with the eccentric orbits and low-mass secondarycomponents. Brightness variations of the primary is due to the periodicalextinction variations on the line-of-sight caused by the disk wind of thesecondary and a common envelope it produces. A matter distribution in theenvelope has been calculated in the ballistic approach. Calculations showedthat for the young binaries with the elliptic orbits parameters of thephotometric minima (their depth, duration and the shape of light curves) dependnot only on the disk wind parameters and an inclination of the binary orbit tothe line-of-sight but also on the longitude of the periastron. A modulation ofthe scattered radiation of the common envelope with a phase of the orbitalperiod has been investigated in the single scattering approach. It is shownthat an amplitude of the modulation is maximal when the system is seen edge-onand has also a non-zero value in the binaries observed pole-on. Possibleapplications of the theory to the young stellar objects are discussed. Inparticular, an attention is payed to a resemblance of the light curves in somemodels with light curves of the objects suspected as candidates to FUORs.Comment: 18 pages, 9 figures, accepted by Astronomy Letter

Disk wind in young binaries and the origin of the cyclic activity of young stars