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Coronal Activity in F-, G-, and K-Type Stars; Empirical Relations Between Stellar Parameters

Published online by Cambridge University Press:  04 August 2017

R. Mewe ,
C.J. Schrijver ,
E.H.B.M. Gronenschild  and
C. Zwaan
R. Mewe
Affiliation:
The Astronomical Institute, Space Research Laboratory Beneluxlaan 21, 3527 HS Utrecht, The Netherlands
C.J. Schrijver
Affiliation:
The Astronomical Institute, Space Research Laboratory Beneluxlaan 21, 3527 HS Utrecht, The Netherlands
E.H.B.M. Gronenschild
Affiliation:
The Astronomical Institute, Space Research Laboratory Beneluxlaan 21, 3527 HS Utrecht, The Netherlands
C. Zwaan
Affiliation:
The Astronomical Institute, Space Research Laboratory Beneluxlaan 21, 3527 HS Utrecht, The Netherlands

Abstract

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For a sample of 58 late type stars we analyse the relations between the soft X-ray flux density Fx, the Ca II H and K line-core flux density FH+K, and parameters determining the global stellar structure. By analysing the soft X-ray spectra from 15 stars we determine the coronal temperatures T and specific emission measures per unit area ζ. We discuss the dependence of T on B-V, Fx and stellar radius R. The diagram of the specific emission measure ζ against the temperature T is interpreted in terms of a coronal model consisting of static loops. Also, a search for time variations in the X-ray flux has been performed.

Type
II. Rotation — Activity — Cycle — Age Connection: Observations
Information
Symposium - International Astronomical Union , Volume 102: Solar and Stellar Magnetic Fields: Origins and Coronal Effects , 1983 , pp. 205 - 210
Copyright
Copyright © Reidel 1983 

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