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Processing of icy mantles in protostellar envelopesWe have obtained CO absorption profiles of several young stellar objects (YSOs), spanning a range of mass and luminosity, in order to investigate their ice mantle composition. We present the first detection of CO toward the class I YSO L1489 IRS in the Taurus dark cloud. In general, the CO profiles for YSOs show evidence for both processed and pristine ices in the same line of sight, strong indirect evidence for CO, is suggested in R CrA IRS 7, L1489 IRS, Elias 18, and GL 961E. Toward other sources (R CrA IRS 1, IRS 2, W33A, NGC 7538 IRS 9, Mon R2 IRS 2) CO is present in (nearly) pure form. We propose an evolutionary scenario to explain the chemical diversity of the icy mantles toward these objects.
Document ID
20040120071
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Chiar, J. E.
(Rensselaer Polytechnic Institute, Department of Physics Applied Physics, and Astronomy, Troy, NY 12180, United States)
Gerakines, P. A.
Whittet, D. C.
Pendleton, Y. J.
Tielens, A. G.
Adamson, A. J.
Boogert, A. C.
Date Acquired
August 22, 2013
Publication Date
May 10, 1998
Publication Information
Publication: The Astrophysical journal
Volume: 498
Issue: 2 Pt 1
ISSN: 0004-637X
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAG5-3339
CONTRACT_GRANT: NAGW-4039
Distribution Limits
Public
Copyright
Other

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