Other
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251..113g&link_type=abstract
Astrophysical Journal, Part 1, vol. 251, Dec. 1, 1981, p. 113-125.
Other
49
Calcium, Chromosphere, Iue, Magnesium, Satellite Observation, T Tauri Stars, Ultraviolet Spectra, H Lines, K Lines, Main Sequence Stars, Metal Ions, Radiant Flux Density, Stellar Atmospheres
Scientific paper
IUE satellite and Lick 3 m reflector image tube scanner measurements of the Mg II and Ca II resonance lines in a sample of T Tauri stars are the basis of a discussion of the Mg II h and k line emission and the Ca II H and K line emission, within the context of stellar chromospheres. Corroborative evidence is presented for the chromospheric origin of these resonance lines, and chromospheric radiative loss rates in the Mg II and Ca II resonance lines are derived. It is found that the degree of nonradiative heating present in the outer atmospheres of T Tauri stars generally exceeds that of the RS CVn systems, as well as the dMe stars and other active chromospheric dwarfs, and it is inferred that the surfaces of such pre-main sequence stars are covered by regions similar to solar plages. The mean chromospheric electron density of T Tauri stars is determined as 10 to the 11th/cu cm.
Calvet Nuria
Giampapa Mark S.
Imhoff Catherine L.
Kuhi Leonard V.
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