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Interstellar C2 molecules in a Taurus dark cloudFive relatively strong interstellar absorption lines of C2 in the (2-0) Phillips band near 8670 A have been detected toward the heavily reddened, late B star HD 29647, which lies behind a substantial part of one of the darkest regions of the nearest molecular cloud complex, the dark clouds of Taurus. Stringent upper limits on the C2 absorption toward two lightly reddened stars, Nu Cyg and Omicron And, are also reported. The observations yield a column density of about 9 x 10 to the 13th/sq cm, comparable to those of widely distributed molecules like CH and H2CO. Theoretical treatment of the data yields a kinetic temperature of 14 K and a mean density of less than about 1000/cu cm. A narrow, anomalously strong, stellar Mn II line yields a projected rotational velocity of less than about 7 km/s and is explained by previous identifications of the star as Hg-Mn peculiar.
Document ID
19830061873
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hobbs, L. M.
(Yerkes Observatory Williams Bay, WI, United States)
Black, J. H.
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Van Dishoeck, E. F.
(Leiden, Sterrewacht, Rijksuniversiteit Leiden, Netherlands)
Date Acquired
August 11, 2013
Publication Date
August 15, 1983
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters to the Editor
Volume: 271
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
83A43091
Funding Number(s)
CONTRACT_GRANT: NSF AST-81-14718
CONTRACT_GRANT: NGR-14-001-147
Distribution Limits
Public
Copyright
Other

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