Morpho-kinematics around cool evolved stars Unveiling the underlying companion
Abstract
Because they lose tremendous amounts of mass, cool evolved stars are major sources of dust and molecules for the interstellar medium. Spectro-imaging of the dust-driven winds around these stars has enabled us to identify recurring nonspherical patterns (e.g. spirals, arcs, compressed wind). We use radiative-hydrodynamic simulations of dust-driven winds to study the imprints left in the wind by an orbiting stellar or sub-stellar companion. We designed 3D numerical setup to solve the wind dynamics beyond the dust condensation radius and follow the flow up to several hundreds of stellar radii. Non-uniform grids enable us to capture small scale features such as shocks or disks forming around the orbiting object. Depending on its mass and orbital parameters, we reproduced typical non-spherical features such as arcs, spirals, petals and orbital density enhancements, and identified patterns associated to eccentric orbits.
- Publication:
-
The Origin of Outflows in Evolved Stars
- Pub Date:
- 2022
- DOI:
- 10.1017/S1743921322000898
- Bibcode:
- 2022IAUS..366..240E
- Keywords:
-
- stars:evolution;
- stars:winds;
- outflows;
- stars:AGB and post-AGB;
- methods:numerical;
- binaries:general