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  The geometry and dynamical role of stellar wind bubbles in photoionized HII regions

Geen, S., Bieri, R., Rosdahl, J., & de Koter, A. (2020). The geometry and dynamical role of stellar wind bubbles in photoionized HII regions. Monthly Notices of the Royal Astronomical Society, 501(1), 1352-1369. doi:10.1093/mnras/staa3705.

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Geen, Sam, Author
Bieri, Rebekka1, Author              
Rosdahl, Joakim, Author
de Koter, Alex, Author
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1Galaxy Formation, MPI for Astrophysics, Max Planck Society, ou_2205643              

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 Abstract: Winds from young massive stars contribute a large amount of energy to their host molecular clouds. This has consequences for the dynamics and observable structure of star-forming clouds. In this paper, we present radiative magnetohydrodynamic simulations of turbulent molecular clouds that form individual stars of 30, 60, and 120 solar masses emitting winds and ultraviolet radiation following realistic stellar evolution tracks. We find that winds contribute to the total radial momentum carried by the expanding nebula around the star at 10 per cent of the level of photoionization feedback, and have only a small effect on the radial expansion of the nebula. Radiation pressure is largely negligible in the systems studied here. The 3D geometry and evolution of wind bubbles is highly aspherical and chaotic, characterized by fast-moving ‘chimneys’ and thermally driven ‘plumes’. These plumes can sometimes become disconnected from the stellar source due to dense gas flows in the cloud. Our results compare favourably with the findings of relevant simulations, analytic models and observations in the literature while demonstrating the need for full 3D simulations including stellar winds. However, more targeted simulations are needed to better understand results from observational studies.

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 Dates: 2020-11-27
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/staa3705
Other: LOCALID: 3291549
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Title: Monthly Notices of the Royal Astronomical Society
  Other : Mon. Not. R. Astron. Soc.
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press
Pages: - Volume / Issue: 501 (1) Sequence Number: - Start / End Page: 1352 - 1369 Identifier: ISSN: 1365-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000024150