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Spectral evolution of young stellar objectsAn 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.
Document ID
19870043707
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Adams, Fred C.
(California Univ. Santa Barbara, CA, United States)
Lada, Charles J.
(California Univ. Santa Barbara, CA, United States)
Shu, Frank H.
(California, University Santa Barbara, United States)
Date Acquired
August 13, 2013
Publication Date
January 15, 1987
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 312
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
87A30981
Funding Number(s)
CONTRACT_GRANT: NSF AST-83-14682
Distribution Limits
Public
Copyright
Other

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