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Morpho-kinematics around cool evolved stars Unveiling the underlying companion

Published online by Cambridge University Press:  30 November 2022

I. El Mellah Open the ORCID record for I. El Mellah [Opens in a new window] ,
J. Bolte ,
L. Decin ,
W. Homan  and
R. Keppens
I. El Mellah
Affiliation:
Institut de Planétologie et d’Astrophysique de Grenoble, UGA-CNRS, rue de la Piscine, 38400 email: [email protected]
J. Bolte
Affiliation:
Institute of Astronomy, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
L. Decin
Affiliation:
Institute of Astronomy, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium
W. Homan
Affiliation:
Institut d’Astronomie et d’Astrophysique, campus Plaine, Boulevard du Triomphe, Brussels, Belgium
R. Keppens
Affiliation:
Centre for mathematical Plasma-Astrophysics, Celestijnenlaan 200B, 3001 Leuven, Belgium
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Abstract

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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.

Keywords

stars:evolutionstars:winds,outflowsstars:AGB and post-AGBmethods:numericalbinaries:general
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S366: The Origin of Outflows in Evolved Stars , November 2020 , pp. 240 - 245
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Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of International Astronomical Union

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