Vortices in the wakes of AGB stars

Details Vortices in the wakes of AGB stars Vortices in the wakes of AGB stars

2007-03-28

arxiv.org/abs/astro-ph/0703732v1

Astronomy and Astrophysics

Astrophysics

ApJL accepted, preprint form, 13 pages including 4 pages of figures

Scientific paper

10.1086/518308

Vortices have been postulated at a range of size scales in the universe including at the stellar size-scale. Whilst hydrodynamically simulating the wind from an asymptotic giant branch (AGB) star moving through and sweeping up its surrounding interstellar medium (ISM), we have found vortices on the size scale of 10^-1 pc to 10^1 pc in the wake of the star. These vortices appear to be the result of instabilities at the head of the bow shock formed upstream of the AGB star. The instabilities peel off downstream and form vortices in the tail of AGB material behind the bow shock, mixing with the surrounding ISM. We suggest such structures are visible in the planetary nebula Sh 2-188.

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