Other
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...363..654b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 363, Nov. 10, 1990, p. 654-669.
Other
168
Accretion Disks, Early Stars, Echelle Gratings, Stellar Spectrophotometry, T Tauri Stars, Emission Spectra, H Lines, Stellar Evolution, Stellar Mass Accretion, Stellar Spectra
Scientific paper
An extensive set of veiling measurements of T Tauri stars covering almost the entire optical spectrum is presented. These are based on Hamilton echelle spectra obtained during 1987-1989. A full range of T Tauri stars, from 'weak' to 'continuum' stars is studied; in some cases, several spectra of a given target are seen in which the veiling has changed, occasionally dramatically. Veilings are determined using two new methods: one which concentrates on the residual intensities of selected spectral lines, and the other which compares the autocorrelation functions for a T Tauri star and a veiled standard. The general shape of the veiling is often as predicted by accretion disk models: almost flat in the red and increasing in the blue. Cooler stars have generally higher veiling, implying that the veiling power is relatively independent of stellar mass. The relation between veiling and the narrow and broad emission lines supports a nonstellar origin for the veiling and broad line components, and a stellar origin for the narrow lines.
Basri Gibor
Batalha C. C.
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