Heating and cooling by iron in cool star winds

P. Woitke; E. Sedlmayr

Heating and cooling by iron in cool star winds

P. Woitke, E. Sedlmayr

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	617-629
Journal	Astronomy and Astrophysics
Volume	347
Publication status	Published - 1 Jul 1999

Keywords

ATOMIC PROCESSES
HYDRODYNAMICS
RADIATION MECHANISMS: THERMAL
SHOCK WAVES
STARS: CHROMOSPHERES
STARS: CIRCUMSTELLAR MATTER

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http://adsabs.harvard.edu/abs/1999A%26A...347..617W

Cite this

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title = "Heating and cooling by iron in cool star winds",

abstract = "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.",

keywords = "ATOMIC PROCESSES, HYDRODYNAMICS, RADIATION MECHANISMS: THERMAL, SHOCK WAVES, STARS: CHROMOSPHERES, STARS: CIRCUMSTELLAR MATTER",

author = "P. Woitke and E. Sedlmayr",

year = "1999",

month = jul,

day = "1",

language = "English",

volume = "347",

pages = "617--629",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

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TY - JOUR

T1 - Heating and cooling by iron in cool star winds

AU - Woitke, P.

AU - Sedlmayr, E.

PY - 1999/7/1

Y1 - 1999/7/1

N2 - 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.

AB - 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.

KW - ATOMIC PROCESSES

KW - HYDRODYNAMICS

KW - RADIATION MECHANISMS: THERMAL

KW - SHOCK WAVES

KW - STARS: CHROMOSPHERES

KW - STARS: CIRCUMSTELLAR MATTER

M3 - Article

SN - 0004-6361

VL - 347

SP - 617

EP - 629

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

ER -

Heating and cooling by iron in cool star winds

Abstract

Keywords

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