Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....93..204v&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 93, Jan. 1987, p. 204-209.
Astronomy and Astrophysics
Astronomy
5
Atomic Recombination, Carbon, Molecular Clouds, Nebulae, Spectral Line Width, H Ii Regions, Stellar Mass, Stellar Radiation, Ultraviolet Radiation
Scientific paper
Carbon C100-alpha and C125-alpha atomic recombination lines were obtained toward the neutral interface between the molecular cloud and the ionized emission nebula Sharpless 235. A model was constructed of a neutral interface, varying the electron density and temperature, the microturbulent velocity, and the depth of the neutral interface. Best values of these parameters were 3/cu cm, 100 K, 2 km/s, and 0.1 pc, as obtained by comparing the observations with the model. A single, spontaneous emission model is sufficient to fit the data in the wavelength range from 4.6 cm (C100-alpha) to 21 cm (C167-alpha). Furthermore, the observed data are consistent with a pressure equilibrium between the neutral interface and the H II region, implying a small amount of depletion of carbon from gas onto grain surfaces, and with the theory of a cooled post-shock layer inside which massive protostars will eventually form.
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