Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...277..725c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 277, Feb. 15, 1984, p. 725-737. Research supported by the Alexander von Hum
Astronomy and Astrophysics
Astrophysics
88
Chromosphere, Late Stars, Stellar Evolution, Stellar Models, T Tauri Stars, Absorption Spectra, Abundance, Emission Spectra, Line Spectra, Main Sequence Stars, Spectral Energy Distribution, Stellar Atmospheres, Stellar Temperature, Ultraviolet Spectra
Scientific paper
A number of model atmospheres for T Tauri stars are constructed which are characterized by a late-type photosphere plus a chromosphere with a deep-lying temperature minimum. Parameter studies of these models show that they reproduce reasonably well the Ca II, Mg II emission-line fluxes, the continuous energy distribution, the absorption lines, and the ultraviolet lines. The presence of a chromosphere also likely accounts for the veiling phenomenon but is not sufficient to produce the large observed H alpha fluxes in many T Tauri stars, which require a much larger extended emitting region. However, it seems adequate to account for many spectral features of the average T Tauri star which are qualitatively similar to a normal active late-type star.
Basri Gibor
Calvet Nuria
Kuhi Leonard V.
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