Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982sva....26..678k&link_type=abstract
(Astronomicheskii Zhurnal, vol. 59, Nov.-Dec. 1982, p. 1124-1133) Soviet Astronomy (ISSN 0038-5301), vol. 26, Nov.-Dec. 1982, p.
Astronomy and Astrophysics
Astronomy
Dwarf Stars, Late Stars, Stellar Atmospheres, Stellar Flares, Stellar Spectra, Coronal Loops, Electron Density (Concentration), Solar Wind, Stellar Models, Stellar Temperature, X Ray Sources
Scientific paper
The short-wavelength spectra of the stars UX Ari during flare activity and in the quiet state and RW Aur are analyzed. An independent determination of the electron density made it possible to draw the reliable conclusion from the line intensities that the extent of the transition region between chromosphere and corona is considerably greater for these stars and Capella than for the sun. Two groups of stars are distinguished: (1) rotating red dwarfs; (2) subgiants belonging to systems of the RX C Vn-type and T Tau-type stars. The former are characterized by coronal loops emitting in the X-ray region. The appearance of considerable fluxes in lines of ions with Ti = 100,000 K in stars of the latter group without X-ray enhancement is connected with direct heating with T = 10,000-100,000 K and with the development of upward-intensifying motions. Such a dynamical model of the outer atmosphere differs considerably from the usually considered outflow of the solar-wind type, efficiently cooling the coronas of star with low gravity.
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