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Recent advances in non-LTE stellar atmosphere models

Published online by Cambridge University Press:  28 July 2017

Andreas A. C. Sander Open the ORCID record for Andreas A. C. Sander [Opens in a new window]
Andreas A. C. Sander*
Affiliation:
Institut für Physik & Astronomie, Universität Potsdam, Karl-Liebknecht-Str. 24-25, 14476 Potsdam, Germany email: ansander@astro.physik.uni-potsdam.de
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Abstract

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In the last decades, stellar atmosphere models have become a key tool in understanding massive stars. Applied for spectroscopic analysis, these models provide quantitative information on stellar wind properties as well as fundamental stellar parameters. The intricate non-LTE conditions in stellar winds dictate the development of adequate sophisticated model atmosphere codes. The increase in both, the computational power and our understanding of physical processes in stellar atmospheres, led to an increasing complexity in the models. As a result, codes emerged that can tackle a wide range of stellar and wind parameters.

After a brief address of the fundamentals of stellar atmosphere modeling, the current stage of clumped and line-blanketed model atmospheres will be discussed. Finally, the path for the next generation of stellar atmosphere models will be outlined. Apart from discussing multi-dimensional approaches, I will emphasize on the coupling of hydrodynamics with a sophisticated treatment of the radiative transfer. This next generation of models will be able to predict wind parameters from first principles, which could open new doors for our understanding of the various facets of massive star physics, evolution, and death.

Keywords

hydrodynamicsmethods: data analysismethods: numericalradiative transferstars: atmospheresstars: early-typestars: fundamental parametersstars: mass lossstars: windsoutflowsstars: Wolf-Rayet
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S329: The Lives and Death-Throes of Massive Stars , November 2016 , pp. 215 - 222
Copyright
Copyright © International Astronomical Union 2017 

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