Heating and cooling by iron in cool star winds

Details Heating and cooling by iron in cool star winds Heating and cooling by iron in cool star winds

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26a...347..617w&link_type=abstract

Astronomy and Astrophysics, v.347, p.617-629 (1999)

Astronomy and Astrophysics

Astrophysics

7

Atomic Processes, Hydrodynamics, Radiation Mechanisms: Thermal, Shock Waves, Stars: Chromospheres, Stars: Circumstellar Matter

Scientific paper

The role of iron for the energy balance in the extended atmospheres and circumstellar envelopes of cool stars is explored. Based on large non-LTE model atoms for Fe I and Fe II, we study the influence of fine-structure, forbidden, permitted and bound-free transitions on the radiative heating and cooling of the gas under various temperature, density and radiation field conditions. The results are compared to those obtained in LTE and to those calculated when ignoring optical depth effects in the lines. The number of levels in the model atoms necessary to achieve convergence of the results is discussed.

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