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Simulations of Colliding Winds in Massive Binary Systems with Accretion

Published online by Cambridge University Press:  30 November 2022

Amit Kashi Open the ORCID record for Amit Kashi [Opens in a new window]  and
Amir Michaelis Open the ORCID record for Amir Michaelis [Opens in a new window]
Amit Kashi
Affiliation:
Department of Physics, Ariel University, Ariel, 4070000, Israel Astrophysics Geophysics And Space Science Research Center (AGASS), Ariel University, Ariel, 4070000, Israel e-mails: kashi@ariel.ac.il; amirmi@ariel.ac.il
Amir Michaelis
Affiliation:
Department of Physics, Ariel University, Ariel, 4070000, Israel
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Abstract

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We run numerical simulations of massive colliding wind binaries, and quantify the accretion onto the secondary under different conditions. We set 3D simulation of a LBV–WR system and vary the LBV mass loss rate to obtain different values of wind momentum ratio η. We show that the mean accretion rate for stationary systems fits a power law Macc∝ η–1.6 for a wide range of η, until for extremely small η saturation in the accretion is reached. We find that the stronger the primary wind, the smaller the opening angle of the colliding wind structure (CWS), and compare it with previous analytical estimates. We demonstrate the efficiency of clumpy wind in penetrating the CWS and inducing smaller scale clumps that can be accreted. We propose that simulations of colliding winds can reveal more relations as the ones we found, and can be used to constrain stellar parameters.

Keywords

stars: massivestars: mass-lossstars: winds, outflows(stars:) binaries: generalstars: Wolf-Rayetaccretion, accretion disks
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 16 , Symposium S366: The Origin of Outflows in Evolved Stars , November 2020 , pp. 144 - 158
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of International Astronomical Union

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