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Observations of stellar coronae

Published online by Cambridge University Press:  04 August 2017

G. S. Vaiana  and
S. Sciortino
G. S. Vaiana
Affiliation:
Osservatorio Astronomico di Palermo Palazzo dei Normanni 00134 Palermo, ITALY
S. Sciortino
Affiliation:
Osservatorio Astronomico di Palermo Palazzo dei Normanni 00134 Palermo, ITALY

Abstract

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We present an overview of recent stellar X-ray observations, with some discussion of the requirements for future observations. We argue that solar observations indicate that coronal X-ray emission is strongly related to surface magnetic field activity; we show that the interpretation of X-ray stellar coronal emission from late-type stars within the framework of models analogous to those developed for the solar corona is viable, and it is supported by many experimental results. The extension of this solar analogy to the early-type stars is quite questionable and remains an unsolved problem, while the working hypothesis of an X-ray phase, related to phenomena of magnetic field-related activity, as contrasted to a wind phase during the PMS evolutionary stage is suggested by the present status of observations.

Type
Stellar Coronae: Chromospheres of Cool Stars
Information
Symposium - International Astronomical Union , Volume 122: Circumstellar Matter , 1987 , pp. 333 - 345
Copyright
Copyright © Reidel 1987 

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