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The infrared spectrum of M8 E - Evidence for circumstellar COHigh-resolution spectroscopic observations of the compact infrared source M8 E are reported in the region from 3 to 5 microns. Very prominent CO absorption lines are observed in the v = 1-0 band at 4.7 microns. The velocity width and rotational temperature suggest that this CO absorption occurs in a highly excited region. The high background continuum flux level and the prominent appearance of the CO features suggest that the CO line-forming region must be in front of the dust emission region. A blister model for M8 E, which places most of the dust continuum emission behind the source, satisfies this requirement. According to this picture, the observed circumstellar CO spectrum shows a high rotational temperature and a large velocity dispersion because of the combined effects of the strong stellar wind and possible shock heating near the dust zone as the wind encounters the ambient molecular cloud.
Document ID
19870023906
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Larson, H. P.
(Arizona Univ. Tucson, AZ, United States)
Fink, U.
(Arizona, University Tucson, United States)
Hofmann, R.
(Max-Planck-Institut fuer extraterrestrische Physik Garching, Germany)
Date Acquired
August 13, 2013
Publication Date
August 1, 1986
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 307
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
87A11180
Funding Number(s)
CONTRACT_GRANT: NAG2-206
CONTRACT_GRANT: NSG-7070
Distribution Limits
Public
Copyright
Other

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