The transition layer of eleven late-type stars

Details The transition layer of eleven late-type stars The transition layer of eleven late-type stars

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...138..164f&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 138, no. 1, Sept. 1984, p. 164-168.

Astronomy and Astrophysics

Astronomy

Late Stars, Transition Layers, Ultraviolet Astronomy, Abundance, Dwarf Stars, Emission Spectra, Far Ultraviolet Radiation, Giant Stars, K Stars, Optical Thickness, Subdwarf Stars

Scientific paper

Far UV-spectra of eleven F, G, and K stars of different luminosity class have been studied. Si IV, C IV, and N V emission line fluxes have been used to obtain parameters for the transition region. The stars of the sample have been classified according to the activity level. Using two abundance criteria the gaseous pressure upper limits have been computed and they show a correlation with the line surface fluxes. From a beta(1)-beta(2) diagram the mass column density ratio has been derived. For all the stars selected the optical depth in the line center presents the following trend: tau(Si IV) greater than tau(C IV) greater than tau(N V).

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