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Stellar Winds and Coronae in Cool Stars

Published online by Cambridge University Press:  12 April 2016

A.K. Dupree  and
L. Hartmann
A.K. Dupree
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138/USA
L. Hartmann
Affiliation:
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138/USA

Abstract

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Recent observational and theoretical results are reviewed that pertain to the presence and characteristics of stellar coronae and winds in late-type stars. It is found that stars - principally dwarfs - exist with “hot” coronae similar to the Sun with thermally driven winds. For stars, at the lowest effective temperatures, and gravities characteristic of supergiant and giant stars, high temperature (~105K) atmospheres are absent (or if present are substantially weaker than in the dwarf stars), and massive winds are present. There also exist “hybrid” examples - luminous stars possessing both a “hot” corona and a supersonic stellar wind. Constraints for theoretical models are discussed.

Type
4. Some Effects of Stellar Turbulence
Information
International Astronomical Union Colloquium , Volume 51: Stellar Turbulence , 1980 , pp. 279 - 291
Copyright
Copyright © Springer-Verlag 1980

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