Other
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..209p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 1, June 10, 1992, p. 209-217.
Other
36
Spectrum Analysis, Stellar Models, Stellar Spectra, Stellar Structure, Absorption Spectra, Emission Spectra, Line Spectra, Orion Constellation, Stellar Luminosity
Scientific paper
The paper addresses several difficulties with the accretion disk interpretation of the spectra of FU Orionis objects. It is argued that the double absorption lines observed in FU Ori and other members of the group, which have been claimed to be the signature of a self-luminous Keplerian disk, can be produced equally well by a single rotating star. The properties of the absorption-line spectrum of FU Ori as observed at a resolution of about 50,000 are described and compared to simple models of a single rotator with a stratified atmosphere. It is shown that the line structure of FU Ori can be reproduced by a model consisting of an emission-line shell overlaid by a cooler absorbing layer, the two superimposed upon a macroturbulent G-type supergiant spectrum. In the present model, the appearance of line doubling is due to the appearance of weak emission cores in the metallic absorption lines, while curve-of-growth effects account for the observed dependence of reversal intensity upon absorption line strength.
Herbig George H.
Petrov P. P.
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