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Spectral evolution of young stellar objects
Adams, Fred C.; Lada, Charles J.; Shu, Frank H.
AA(California, University, Santa Barbara), AB(California, University, Santa Barbara), AC(California, University, Santa Barbara)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 15, 1987, p. 788-806. NASA-supported research. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Pre-Main Sequence Stars, Protostars, Spectral Energy Distribution, Star Formation, Stellar Evolution, Infrared Spectra, Stellar Models, T Tauri Stars
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An evolutionary sequence, from protostars to pre-main sequence stars, for the classification of young stellar objects is derived by comparing the predictions of the theoretical protostar models of Adams and Shu (AS, 1986) with the morphological classification scheme of Lada and Wilking (1984). It is shown that the AS models adequately explain the emergent spectral energy distributions of unidentified objects with negative spectral indices in the mid-IR and near-IR in both Taurus and Ophiuchus. If the infalling dust envelope is then completely removed, the spectra of the underlying stars and nebular disks used by AS provide a natural explanation for the near-IR and mid-IR excesses and the positive spectral indices of embedded T Tauri stars. It is found that the addition of a simple physical model for residual dust envelopes can reproduce the far-IR excesses found in some of these T Tauri stars.

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