Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...271l..95h&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 271, Aug. 15, 1983, p. L95-L99. Research supported
Astronomy and Astrophysics
Astrophysics
34
Absorption Spectra, Astronomical Spectroscopy, Carbon, Interstellar Matter, Molecular Clouds, Nebulae, B Stars, Line Spectra, Molecular Rotation
Scientific paper
Five 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.
Black John Harry
Hobbs Lew M.
van Dishoeck Ewine F.
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