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The Effect of Scattering on the Temperature Stratification of 3D Model Atmospheres of Metal-Poor Red Giants

Published online by Cambridge University Press:  12 August 2011

Remo Collet ,
Wolfgang Hayek  and
Martin Asplund
Remo Collet
Affiliation:
Max Planck Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D–85741 Garching, Germany email: remo@mpa-garching.mpg.de, hayek@mpa-garching.mpg.de, asplund@mpa-garching.mpg.de
Wolfgang Hayek
Affiliation:
Max Planck Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D–85741 Garching, Germany email: remo@mpa-garching.mpg.de, hayek@mpa-garching.mpg.de, asplund@mpa-garching.mpg.de Research School of Astronomy & Astrophysics, Cotter Road, Weston ACT 2611, Australia Institute for Theoretical Astrophysics, Sem Sælands Vei, N–0315 Oslo, Norway
Martin Asplund
Affiliation:
Max Planck Institut für Astrophysik, Karl-Schwarzschild-Str. 1, D–85741 Garching, Germany email: remo@mpa-garching.mpg.de, hayek@mpa-garching.mpg.de, asplund@mpa-garching.mpg.de
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Abstract

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We study the effects of different approximations of scattering in 3D radiation-hydrodynamics simulations on the photospheric temperature stratification of metal-poor red giant stars. We find that assuming a Planckian source function and neglecting the contribution of scattering to extinction in optically thin layers provides a good approximation of the effects of coherent scattering on the photospheric temperature balance.

Keywords

stars: atmospheresconvectionhydrodynamicsradiative transferscatteringmethods: numerical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S271: Astrophysical Dynamics: From Stars to Galaxies , June 2010 , pp. 373 - 374
Copyright
Copyright © International Astronomical Union 2011

References

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