H109-alpha recombination line observations of S187 and of S298

Details H109-alpha recombination line observations of S187 and of S298 H109-alpha recombination line observations of S187 and of S298

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978aj.....83.1214r&link_type=abstract

Astronomical Journal, vol. 83, Oct. 1978, p. 1214-1218.

Astronomy and Astrophysics

Astronomy

5

Astronomical Spectroscopy, H Alpha Line, Nebulae, Cosmic Dust, Electron Density (Concentration), Electron Energy, H Ii Regions, Hydrogen Recombinations, Morphology

Scientific paper

The H109-alpha recombination line has been detected in S187 and S298. These observations and previously reported 6-cm continuum observations have been used to derive the large-scale properties of the core-envelope-type structure of these nebulae. An electron temperature of 9750 K and a core-to-envelope electron density ratio of 4 are derived for S298. In S187 an electron temperature of 6200 K and a core-to-envelope electron density ratio of greater than 10 are found. The relationship of the common centrally condensed structure of H II regions to the morphology of dark cloud complexes is considered.

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