Abstract
New spectroscopic and photometric observations of luminous cool stars enable us to identify and map out the presence of various heating mechanisms in the color-magnitude diagram. Low mass stars on the main sequence show clear magnetic dynamo activity. As a star evolves off the main sequence and moves toward the supergiant region, or across and up the red giant branch, observations suggest that non-magnetic heating processes occur and eventually dominate in the atmospheres of giant and supergiant stars. The coolest and most luminous stars may have pure hy-drodynamic chromospheres. Hybrid giant and supergiant stars appear to provide the link between the magnetically-dominated atmosphere and the hydrodynamic chromosphere.
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Dupree, A.K. (1991). New Clues to Atmospheric Heating Processes in Luminous Cool Stars. In: Ulmschneider, P., Priest, E.R., Rosner, R. (eds) Mechanisms of Chromospheric and Coronal Heating. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-87455-0_39
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DOI: https://doi.org/10.1007/978-3-642-87455-0_39
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