Coronal activity in F-, G-, and K-type stars

Details Coronal activity in F-, G-, and K-type stars Coronal activity in F-, G-, and K-type stars

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ssrv...30..191m&link_type=abstract

(European Space Agency, ESLAB Symposium on X-ray Astronomy, 15th, Amsterdam, Netherlands, June 22-26, 1981.) Space Science Revie

Astronomy and Astrophysics

Astronomy

32

F Stars, G Stars, H Lines, K Lines, K Stars, Late Stars, Stellar Coronas, X Ray Astronomy, Cool Stars, Heao 2, Radiant Flux Density, Stellar Luminosity, Stellar Magnetic Fields, Stellar Spectra, Stellar Temperature

Scientific paper

The X-ray flux, emission measure, and coronal temperature of some 20 cool stars of luminosity classes III-V are discussed as a function of Ca II H and K line-core flux, spectral type, and luminosity class. The discussion is based on soft X-ray (0.3-3.5 keV) observations with the Imaging Proportional Counter onboard the Einstein Observatory. A crude correlation is found between the X-ray flux Fx and the Ca II flux F(H+K), which is considerably improved by plotting Fx against the excess flux Delta F(H+K). The relationship between Fx and Delta F(H+K) shows no significant dependence on the spectral type or luminosity class and suits both binaries and single stars. However, the coronal temperature is shown to depend strongly on the luminosity class. The results obtained are interpreted in terms of magnetic activity.

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