Journal article
Partially coherent scattering in stellar chromospheres. III: A second-order escape probability method
The Astrophysical journal, Vol.390(2), pp.583-589
05/10/1992
DOI: 10.1086/171309
Abstract
Radiative transfer employing "second-order" escape probability methods has only been applied in cases where photons undergo complete redistribution (CRD) in each scattering. We develop an approximate radiative transfer equation using generalized escape probabilities, applicable even in the presence of nearly coherent scattering in the damping wings of resonance lines. Solving the derived equation produces so-called second-order accuracy because it accounts for the interception of photons originating deep in the atmosphere by layers closer to the surface, analogous to probabilistic methods in CRD. We also find approximate analytic solutions that can be applied in special regimes and achieve good agreement with accurate numerical results. Because the methods derived are extremely fast, applications to radiative hydrodynamics and multidimensional transfer are anticipated, although refinements to our static plane-parallel approach will be required.
Details
- Title: Subtitle
- Partially coherent scattering in stellar chromospheres. III: A second-order escape probability method
- Creators
- K. G Gayley - Univ. Colorado, joint inst. lab. astrophysics, Boulder CO 80309, United States
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.390(2), pp.583-589
- Publisher
- University of Chicago Press
- DOI
- 10.1086/171309
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Language
- English
- Date published
- 05/10/1992
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9984428684102771
Metrics
1 Record Views