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- W2019069988 abstract "The theoretical condition for a spectrum line to appear in emission is stated in terms of a parameter which measures the departure from thermodynamic equilibrium of the atmosphere. It is shown briefly that only in very hot stars can emission lines arise in what might be called a normal stellar atmosphere. A simplified method for deriving approximate values of the extent of the atmospheres in Ae and Be stars from the intensities of the Balmer emission lines, originally derived by the authors, is outlined, and some applications are described. A simplified theory of the Balmer decrement in these stars is also discussed. In the second part of the paper a brief summary is given of the different classes of late-type emission objects: long-period variables, RV Tauri and semi-regular variables, population II cepheids (W Virginis variables), cluster-type variables, classical cepheids, stars embedded in dense obscuring clouds (T Tauri stars), flare stars, late-type dwarfs, solar-type stars, some binary systems, R Coronae Borealis stars, explosive dwarf stars (SS Cygni variables). Some physical ideas concerning these are described." @default.
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- W2019069988 date "1956-01-01" @default.
- W2019069988 modified "2023-09-23" @default.
- W2019069988 title "Emission lines and stellar atmospheres" @default.
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- W2019069988 doi "https://doi.org/10.1016/0083-6656(56)90073-3" @default.
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