Radiative processes in cool star chromospheres

C. Jordan Smith; P. Judge

doi:10.1088/0031-8949/1984/T8/007

Radiative processes in cool star chromospheres

C. Jordan Smith, P. Judge

Solar Frontiers

University of Oxford

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16 Scopus citations

Abstract

Observations made with the International Ultraviolet Explorer (IUE) satellite between 1200Å and 3000Å have shown that the spectra of giant and supergiant stars later than about K O are dominated by emission from neutral atoms and singly charged ions. This is in contrast to the spectra of G-type and main sequence stars which show species typical of the solar transition region. The cool star spectra show many examples of photo-excitation, line-leaking and fluorescent processes, some of which are discussed here. There is evidence that the H Ly α and H Ly β lines play an important role in the production of emission from O I, S I and Fe II. Some lines which remain without satisfactory explanations in both the stellar and solar spectra are discussed.

Original language	English
Pages (from-to)	43-48
Number of pages	6
Journal	Physica Scripta
Volume	1984
Issue number	T8
DOIs	https://doi.org/10.1088/0031-8949/1984/T8/007
State	Published - Jan 1 1984

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title = "Radiative processes in cool star chromospheres",

abstract = "Observations made with the International Ultraviolet Explorer (IUE) satellite between 1200{\AA} and 3000{\AA} have shown that the spectra of giant and supergiant stars later than about K O are dominated by emission from neutral atoms and singly charged ions. This is in contrast to the spectra of G-type and main sequence stars which show species typical of the solar transition region. The cool star spectra show many examples of photo-excitation, line-leaking and fluorescent processes, some of which are discussed here. There is evidence that the H Ly α and H Ly β lines play an important role in the production of emission from O I, S I and Fe II. Some lines which remain without satisfactory explanations in both the stellar and solar spectra are discussed.",

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AU - Judge, P.

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N2 - Observations made with the International Ultraviolet Explorer (IUE) satellite between 1200Å and 3000Å have shown that the spectra of giant and supergiant stars later than about K O are dominated by emission from neutral atoms and singly charged ions. This is in contrast to the spectra of G-type and main sequence stars which show species typical of the solar transition region. The cool star spectra show many examples of photo-excitation, line-leaking and fluorescent processes, some of which are discussed here. There is evidence that the H Ly α and H Ly β lines play an important role in the production of emission from O I, S I and Fe II. Some lines which remain without satisfactory explanations in both the stellar and solar spectra are discussed.

AB - Observations made with the International Ultraviolet Explorer (IUE) satellite between 1200Å and 3000Å have shown that the spectra of giant and supergiant stars later than about K O are dominated by emission from neutral atoms and singly charged ions. This is in contrast to the spectra of G-type and main sequence stars which show species typical of the solar transition region. The cool star spectra show many examples of photo-excitation, line-leaking and fluorescent processes, some of which are discussed here. There is evidence that the H Ly α and H Ly β lines play an important role in the production of emission from O I, S I and Fe II. Some lines which remain without satisfactory explanations in both the stellar and solar spectra are discussed.

UR - https://www.scopus.com/pages/publications/84957312394

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DO - 10.1088/0031-8949/1984/T8/007

M3 - Article

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SN - 0031-8949

VL - 1984

SP - 43

EP - 48

JO - Physica Scripta

JF - Physica Scripta

IS - T8

ER -

Radiative processes in cool star chromospheres

Abstract

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