Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980afz....16..243g&link_type=abstract
(Astrofizika, vol. 16, Apr.-June 1980, p. 243-256.) Astrophysics, vol. 16, no. 2, Oct. 1980, p. 147-155. Translation.
Astronomy and Astrophysics
Astrophysics
13
Emission Spectra, Stellar Mass Accretion, Stellar Radiation, Stellar Spectra, Subgiant Stars, T Tauri Stars, Balmer Series, Chromosphere, Early Stars, Line Spectra, Ubv Spectra
Scientific paper
The theoretical and observed Balmer decrements of T Tau stars are compared on the basis of data from the catalog of Kuhi and Cohen. It is shown that emission in the Balmer lines of chromospheric origin (in pure form) is not characteristic of the majority of stars of this type. However, it is present as a constituent part of the radiation in the spectra of approximately one third of the stars. The major part of the line emission is formed in a circumstellar envelope. The origin of the continuum ultraviolet emission of T Tau stars is considered for the example of DF Tau. Possible activity mechanisms of T Tau stars are discussed. It is shown that the process of accretion of gas from a circumstellar envelope in conjunction with the effects of the eclipses of the star by gas-dust envelopes provides a reasonable explanation of all the observed properties of stars of this type.
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