PHYSICOCHEMICAL EVOLUTION OF INTERSTELLAR DUST MATERIAL IN THE PROCESS OF HEATING

Simulation of the selective volatilization of the material of an inter stellar dust particle in the process of its thermal evolution (200-180 0 K) showed that its density varies within 3-5 g/cm(3), a range charac teristic of the density of small bodies (without taking into account t he ice component), the terrestrial planets, and the Moon. It may be as sumed that variations in the composition of bodies of the Solar System , with the exception of iron meteorites and Mercury, are primarily due to the selective volatilization of the material of interstellar dust particles in the process of their thermal evolution.