Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138..258s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 2, Sept. 1984, p. 258-266.
Astronomy and Astrophysics
Astronomy
67
F Stars, G Stars, K Stars, Stellar Activity, Stellar Coronas, Stellar Rotation, X Ray Astronomy, Spectrum Analysis, Stellar Models, Stellar Spectra, Stellar Structure
Scientific paper
Einstein Observatory soft X-ray spectra for a sample of 34 late-type stars are analyzed in order to determine coronal temperatures and emission features per unit area at the stellar surface. No obvious relation between coronal temperature and (B-V) color index could be found. Coronal temperature is dependent on stellar luminosity class. The data are discussed in terms of a model for static magnetic loops, and indications are found for a variety of coronae in which the sizes of the dominating loops range from more compact than loops in solar-active regions to loops that are comparable to the pressure scale height (or even greater). Despite observed structural differences, a single, strict relation holds between X-ray surface flux density and the Ca II H + K excess flux density of these stars. Coronal activity and structure are noted to be related to the stellar rotation rate.
Mewe Rolf
Schrijver Carolus J.
Walter Fred M.
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