Wide Binary Effects on Asymmetries in Asymptotic Giant Branch Circumstellar Envelopes

摘要: Observations of increasingly higher spatial resolution reveal the existence asymmetries in circumstellar envelopes a small fraction asymptotic giant branch (AGB) stars. Although there is no general consensus for their origin, binary companion star may be responsible. Within this framework, we investigate gravitational effects associated with sufficiently wide system, where Roche lobe overflow unimportant, on outflowing AGB stars using three dimensional hydrodynamic simulations. The due to individual components are separately studied, enabling investigation stellar and characteristics detail. reflex motion alters wind velocity distribution, thereby, determining overall shape envelope. On other hand, interaction envelope produces wake, which exhibits vertically thinner shape. two patterns overlap form clumpy structures. To illustrate diversity shapes, present numerical results as function inclination angle. Not only spiral structure produced by interaction, but arc also found that represent former when viewed at different inclinations. arcs systematic shift centers curvature cases orbital speed comparable its speed. They take peanut inclinations nearly edge-on. In limit slow relative speed, pattern becomes spherically symmetric. We find aspect ratio oblate an important diagnostic probe it can used constrain star, moreover mass ratio.