Bow shocks, bow waves, and dust waves – II. Beyond the rip point

摘要: Dust waves are a result of gas-grain decoupling in stream dusty plasma that flows past luminous star. The radiation field is sufficiently strong to overcome the collisional coupling between grains and gas at "rip-point", where ratio pressure exceeds critical value roughly 1000. When rip point occurs outside hydrodynamic bow shock, separate dust wave may form, decoupled from shell, which can either be drag-confined or inertia-confined, depending on density relative velocity. In case, there minimum velocity 60 km/s allows steady-state stagnant drift solution for apex. For lower velocities, dynamics close axis exhibit limit cycle behavior (rip snap back) two different radii. Strong charged plasma's magnetic modify these effects, but quasi-parallel orientation results qualitatively similar non-magnetic case. quasi-perpendicular field, other hand, formation strongly suppressed.