Double Core Evolution. X. Through the Envelope Ejection Phase

摘要: The evolution of binary systems consisting an asymptotic giant branch star mass equal to 3 M☉ or 5 and a main-sequence 0.4 0.6 with orbital periods 200 days has been followed from the onset through late stages common-envelope phase. Using nested grid technique, three-dimensional hydrodynamical simulations radii ~1 AU indicate that significant fraction envelope gas is unbound (~31% 23% for binaries M☉, respectively) by ends efficiency ejection process ~40%. During intermediate phase, differentially rotating structure resembling thick disk surrounds remnant briefly before energy input orbits companion core drive away. While original volume virtually evacuated in stages, most remains marginally bound on grid. At our simulations, when decay timescale exceeds about yr, orbit one another period day (2.4 involving more evolved giant), although this upper limit final period. For common may not be completely ejected. results are found sensitive degree which initial system departs synchronous state.