Dynamic mass exchange in doubly degenerate binaries. I - 0.9 and 1.2 solar mass stars

摘要: The dynamic mass exchange process in doubly degenerate binaries was investigated using a three-dimensional numerical simulation of the evolution binary system which primary is 1.2-solar-mass white dwarf and Roche lobe filling secondary 0.9-solar-mass dwarf. results show that, little more than two orbital periods, completely destroyed transformed into thick disk orbiting about primary. Since only very small fraction (0.0063 solar mass) escapes system, formation massive object. This object composed three parts, initial primary, hot pressure-supported spherical envelope, rotationally supported outer disk. can be understood terms simple analytical model where it shown that angular momentum carried by during transfer stored determines system. 34 refs.