Peculiarities of mass exchange between components of binary systems in the dynamic mode: V694 Mon and SS 433

We observe events of dynamic mass transfer in the systems V694 Mon and SS 433. In V694 Mon, accretion occurs from an M5–M6 giant onto a white dwarf, while in SS 433 it occurs from an A4–A7 giant onto a neutron star. Both systems exhibit jets, with SS 433 having relativistic ones. In the symbiotic system V694 Mon, we observed the cessation of the disk accretion over three months in 2018. This was followed by the filling of the white dwarf's Roche lobe over the next three years, leading to the formation of an A4 I star within the Roche lobe by 2024, when hydrodynamic equilibrium was reached. The system is no longer considered symbiotic. In the SS 433 system, the Roche lobe of the neutron star is overfilled, resulting in the formation of a star with a neutron core and a convective envelope, known as a Thorne–Żytkow object. Rare powerful explosions occur accompanied by strong infrared radiation excesses. We interprete these explosions as ejections of the envelope of the neutron star or part of this envelope, these ejections are associated with magnetic activity of the neutron star, specifically a magnetar. Based on the wind speed from the system, we estimate the surface temperature of the newly formed star to be 1.5 million K. The star with the neutron core is the source of the power-law spectrum in optics. This object also causes the ellipsoidal effect in the light curves, and the nutation tidal wave that deflects the relativistic jets.