Issue |
A&A
Volume 671, March 2023
|
|
---|---|---|
Article Number | A93 | |
Number of page(s) | 6 | |
Section | Astrophysical processes | |
DOI | https://doi.org/10.1051/0004-6361/202244908 | |
Published online | 09 March 2023 |
Full non-LTE spectral line formation
II. Two-distribution radiation transfer with coherent scattering in the atom’s frame
1
Université de Toulouse, UPS-Observatoire Midi-Pyrénées, CNRS, CNES, IRAP, 31028 Toulouse Cedex 4, France
e-mail: frederic.paletou@univ-tlse3.fr
2
CNRS, Institut de Recherche en Astrophysique et Planétologie, 14 av. E. Belin, 31400 Toulouse, France
3
Indian Institute of Astrophysics, Koramangala, Bengaluru 560034, India
4
Université de Toulouse, Faculté des Sciences et de l’Ingénierie, 31062 Toulouse Cedex 9, France
Received:
7
September
2022
Accepted:
8
January
2023
In this article we discuss a method for obtaining a numerical solution to the so-called full nonlocal thermodynamic equilibrium (non-LTE) radiation transfer problem. More specifically, the usual numerical iterative methods for non-LTE radiation transfer are coupled with that formalism and new numerical additions are explained in detail. We benchmarked the whole process with the standard non-LTE transfer problem for a two-level atom with Hummer’s RI − A partial frequency redistribution function. Finally, we present new quantities, such as the spatial distribution of the velocity distribution function of excited atoms, which can only be accessed by adopting a more general frame for non-LTE radiation transfer, such as the one we propose here.
Key words: radiation mechanisms: general / radiative transfer / line: profiles / methods: numerical
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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