The role of convection and magnetic field in the mass loss of evolved cool stars

Autor: Menezes, Fabian, Chiavassa, Andrea, Freytag, Bernd
Přispěvatelé: Brun, Allan Sacha, Bouvier, Jérôme, Petit, Pascal
Rok vydání: 2022
Předmět:
DOI: 10.5281/zenodo.7377745
Popis: Red supergiants (RSG) and asymptotic giant branch (AGB) stars produce strong stellar winds, which are not well understood. These winds have a key role in the enrichment of the interstellar medium with chemical elements, which are the building blocks for the next generation of stars. The magnetic field in such stars coupled with the atmospheric dynamics may also affect the stellar wind, since it increases atmospheric velocities and higher temperatures in the chromosphere. The understanding of the stellar wind dynamics is crucial for unveiling the unknown mass-loss mechanism, their chemical composition, and their stellar parameters. The radiative-hydrodynamics code, CO5BOLD, solves the equations of compressible hydrodynamics and non-local radiation transport. It is used to produce 3D grids of global ``star-in-a-box'' models. In this ongoing study, we used CO5BOLD to perform simulations of RSG and AGB so we analyze and better understand the mechanisms and rate of mass-loss of such stars related to convection and magnetic field. We could compare the differences between our AGB and RSG models regarding density, velocity, pressure and B field, and found that magnetic fields could be part of the mass-loss mechanism in RSGs.
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Databáze: OpenAIRE
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