Astronomy and Astrophysics – Astronomy
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...256..127r&link_type=abstract
Astrophysical Journal, Part 1, vol. 256, May 1, 1982, p. 127-138.
Astronomy and Astrophysics
Astronomy
32
Emission Spectra, Hydrogen Atoms, Hydrogen Ions, Line Spectra, Nebulae, Astronomical Models, Centimeter Waves, H Ii Regions, Molecular Clouds, Normal Density Functions, Radial Velocity, Radio Sources (Astronomy), Spectral Resolution
Scientific paper
Synthesis observations in continuum and H I line emission at 21 cm, for the case of a 2 deg field containing the IC 5146 emission nebula, show an H II region approximately 8 arcmin in diameter and continuum emission which is symmetric about the exciting star BD +46deg3474. The H I emission line is also confined to a region around the star, but is less symmetrically distributed. The total mass of the H I associated with IC 5146 is 445 + or - 105 solar masses. The absence of H I emission at approaching radial velocities at the position of the H II region substantiates other evidence to the effect that the star and H II region are on the near side of the parent molecular cloud. Using equilibrium ionization and dissociation relations for a BO V star placed 3 pc on the near side of the cloud center, it is possible to reproduce both the projected radial variation of the H I column densities and the H II emission measures.
Irwin Jimmy A.
Roger Robert S.
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