Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.6918h&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #69.18; Bulletin of the American Astronomical Society, Vol. 30, p.1352
Astronomy and Astrophysics
Astronomy
Scientific paper
We present first results of our long-term program whose ultimate goal is to develop multidimensional, self-consistent, non-LTE radiation hydrodynamic and magnetohydrodynamic spectroscopic diagnostics of astronomical objects. As the first step, we have developed an efficient and robust 2-D and 3-D radiation transfer solver, based on the short characteristics method. We assume the source function either to be fully specified (i.e., the so-called formal solution of the transfer equation), or to be given in terms of the equivalent-two-level atom formalism. In the latter case, we have adopted the idea of the Accelerated Lambda Iteration technique to treat iteratively the non-LTE coupling of radiation and matter. We compare the efficiency and numerical accuracy of several variants of the short-characteristics scheme. Finally, we present some illustrative examples of radiative transfer for 2-D and 3-D media with the specified temperature, density, and velocity structure.
Hubeny Ivan
Lanz Thierry
van Noort Michiel
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