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- W2000399797 abstract "The formation of chromospheric resonance line profiles is examined for the case of the relatively low-density atmospheres appropriate to late-type supergiants. The effects of partial frequency redistribution control the emergent line profiles, to the extent that even an isothermal atmosphere can give rise to apparent emission features. Schematic model chromospheres are used to demonstrate the effects of different velocity fields and temperature-density structures on the line profiles, as a first step toward a clearer understanding of the chromospheric line profiles and why supergiants have broad emission lines (the Wilson-Bappu effect). Neither the Doppler nor the mass column density explanation alone can explain the Wilson-Bappu effect in supergiants, but both theories may play a role." @default.
- W2000399797 created "2016-06-24" @default.
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- W2000399797 date "1980-12-01" @default.
- W2000399797 modified "2023-09-23" @default.
- W2000399797 title "Formation of chromospheric resonance line profiles in supergiants" @default.
- W2000399797 doi "https://doi.org/10.1086/158545" @default.
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