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Circumstellar gas associated with HL Tauri - Evidence for a remnant infalling envelopeMolecular carbon absorption lines in the spectrum of HL Tau has been discovered near 8775 A. These C2 lines have a heliocentric radial velocity of 43 + or - 3 km/s, redshifted by 23 + or - 3 km/s relative to the star and the associated molecular cloud. This velocity difference suggests that the molecular carbon absorption arises in an infalling envelope. Since KI and diffuse interstellar bands are much weaker than expected, the chemical composition and/or excitation conditions in the HL Tau envelope appear to differ substantially from those in the interstellar medium.
Document ID
19890048913
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Grasdalen, Gary L.
(Wyoming Univ. Laramie, WY, United States)
Sloan, Gregory
(Wyoming, University Laramie, United States)
Stout, Natalie
(California, University Berkeley, United States)
Strom, Stephen E.
(Wyoming Univ. Laramie, WY, United States)
Welty, Alan D.
(Massachusetts, University Amherst, United States)
Date Acquired
August 14, 2013
Publication Date
April 1, 1989
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 339
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
89A36284
Funding Number(s)
CONTRACT_GRANT: NSF AST-87-12280
Distribution Limits
Public
Copyright
Other

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