Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..949c&link_type=abstract
Astrophysical Journal, Part 1, vol. 234, Dec. 15, 1979, p. 949-957.
Astronomy and Astrophysics
Astrophysics
67
Chromosphere, Photosphere, Stellar Models, Stellar Temperature, T Tauri Stars, Emission Spectra, Line Spectra, Spectrum Analysis, Stellar Atmospheres
Scientific paper
A model for the photospheric and low chromospheric regions of the atmosphere of an advanced T Tauri star has been constructed, by superposing an ad hoc temperature rise on a theoretical model photosphere. This model has been used to synthesize several spectral features, including the continuum from 300 A to 300 microns and the Fe I and Fe II spectrum in the interval 4475-4500 A. A comparison between these predictions and observations supports the conclusion that T Tauri stars possess a chromosphere that begins deep in the atmosphere, with the beginning depth of the chromosphere principally determining the degree of advancement of the T Tauri spectrum. There are a number of spectral features that cannot be explained by this model, including the near-IR excess, the large H alpha:H beta decrement, and the asymmetry of emission lines.
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