Multidimensional radiative transfer in stratified atmospheres
Abstract
Energy transport by radiation is an important contribution to the energy budget in stellar atmospheric structures. In this paper, radiative relaxation of small-scale structures is investigated. The authors show in a linear analysis: (1) Already at structural lengths of 10 opacity scale heights, horizontal photon exchange is important for the energy budget. (2) In atmospheric layers near continuum optical depth τc = 1 and below, the continuum absorption and emission processes dominate the radiative relaxation. (3) Weak spectral lines or lines with σlɛ ≤ 1 have little influence on the energy exchange. (4) At large heights, transport in few spectral lines with σlɛ very large 1 can compete with continuum processes.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 1987
- Bibcode:
- 1987A&A...183...91K
- Keywords:
-
- Energy Transfer;
- Radiative Transfer;
- Relaxation Time;
- Stellar Atmospheres;
- Stellar Oscillations;
- Atmospheric Models;
- Energy Budgets;
- Line Spectra;
- Linear Equations;
- Ubv Spectra;
- Astrophysics