Carbon recombination line observations of the sharpless 140 region

Details Carbon recombination line observations of the sharpless 140 region Carbon recombination line observations of the sharpless 140 region

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...204..781k&link_type=abstract

Astrophysical Journal, vol. 204, Mar. 15, 1976, pt. 1, p. 781-783, 785-788.

Astronomy and Astrophysics

Astronomy

20

Carbon, Early Stars, Line Spectra, Radiative Recombination, Radio Astronomy, Stellar Evolution, Astronomical Models, Electron Density (Concentration), Electron Energy, H Ii Regions, Interstellar Gas, Molecular Ions, Particle Density (Concentration), Photoionization

Scientific paper

Carbon recombination-line emission has been detected at two frequencies from a dark cloud contiguous with the small H II region Sharpless 140. The observations show the dark cloud to be of unusually low temperature and to have a markedly inhomogeneous density distribution, with localized region of high density surrounding one or more embedded stars. The carbon is probably ionized by photons from both the exciting star of S140 and the embedded stars. The dark cloud and S140 apparently represent two stages of star formation which have occurred over a period of at least 500,000 years in adjacent regions of the same dark cloud.

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