Multidimensional radiative transfer in stratified atmospheres

Details Multidimensional radiative transfer in stratified atmospheres Multidimensional radiative transfer in stratified atmospheres

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...183...91k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 183, no. 1, Sept. 1987, p. 91-97.

Astronomy and Astrophysics

Astrophysics

13

Energy Transfer, Radiative Transfer, Relaxation Time, Stellar Atmospheres, Stellar Oscillations, Atmospheric Models, Energy Budgets, Line Spectra, Linear Equations, Ubv Spectra

Scientific paper

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.

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