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The Quiescent Chromospheres and Transition Regions of Active Dwarf Stars: What Are We Learning from Recent Observations and Models?

Published online by Cambridge University Press:  12 April 2016

Jeffrey L. Linsky
Jeffrey L. Linsky*
Affiliation:
Joint Institute for Laboratory Astrophysics National Bureau of Standards and University of Colorado, Boulder, Colorado 80309 USA

Abstract

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I will review the rapid progress in our understanding of active dwarf stars, which has been stimulated by recent IUE, Einstein, and ground-based observations, by asking a series of questions. The most fundamental question is the extent to which magnetic fields control nonflare phenomena in these stars. There are a number of aspects to this question:

(1) What is the evidence for large scale magnetic structures similar to solar plages in these stars and how does a plage system differ from a quiescent spectrum?

(2) Can the enhanced heating in these stars be explained by solar-like magnetic flux tubes?

(3) What roles do systematic flows play in active dwarf atmospheres?

(4) What Is the relation between heating rates in different layers of these stars?

(5) By what mechanisms are active dwarf chromospheres and transition regions heated?

(6) What are semiempirical models telling us about active dwarf stars?

Recent observations are permitting us to begin to answer these questions.

Type
Session I: General Characteristics of Active Dwarfs
Information
International Astronomical Union Colloquium , Volume 71: Activity in Red-Dwarf Stars , 1983 , pp. 39 - 60
Copyright
Copyright © Reidel 1983

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