Observations of neutral carbon in the NGC 1977 bright rim

Details Observations of neutral carbon in the NGC 1977 bright rim Observations of neutral carbon in the NGC 1977 bright rim

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256l...5w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 256, May 1, 1982, p. L5-L8.

Astronomy and Astrophysics

Astrophysics

13

Carbon Monoxide, Hot Stars, Interstellar Chemistry, Molecular Clouds, Photodissociation, Abundance, Astronomical Models, Carbon Isotopes, H Ii Regions, Line Spectra, Nebulae

Scientific paper

Strong neutral carbon emission at 610 microns (492 GHz) has been detected from a bright-rimmed cloud abutting the H II region NGC 1977. The similarity of velocity and width between (C-13)O and C I lines suggests that both lines originate in the same region. A model for the density and temperature structure of the cloud, based on (C-13)O and (C-12)O observations, has been used to estimate the carbon abundance. The abundances of both C I and (C-13)O increase with depth into the cloud away from the rim. The carbon abundance reaches its peak value nearer the rim than does the (C-13)O abundance. This variation in the relative abundance distributions of CO and C I confirms the importance of photodissociation in the chemistry of molecular clouds, and of the C I line to studies of the interaction of hot stars with clouds.

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