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X-ray Spectroscopy across the HR Diagram

Published online by Cambridge University Press:  12 April 2016

J.H.M.M. Schmitt
J.H.M.M. Schmitt*
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik8046 Garching bei MünchenFederal Republic of Germany

Abstract

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X-ray spectra of stellar X-ray sources taken with high, moderate and low spectral resolution are discussed. Only low resolution spectra are available for a sufficiently large number of late-type stars. It is shown that high temperature plasmas (log T > 7) produce the dominant emission component in the coronae of red dwarfs as well as yellow giants, while the coronae of F stars – usually – have X-ray temperatures similar to those found in the quiet Sun. The need for density diagnostics of stellar coronae is stressed and it is argued that the waveband region between 90 – 140 Å is particularly well suited for this purpose.

Type
3. Stellar Coronae
Information
International Astronomical Union Colloquium , Volume 115: High Resolution X-ray Spectroscopy of Cosmic Plasmas , 1990 , pp. 110 - 121
Copyright
Copyright © Cambridge University Press 1990

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