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EMISSION LINE OBSERVATIONS OF H II REGIONS

Published online by Cambridge University Press:  14 August 2015

J. H. Lacy
J. H. Lacy*
Affiliation:
Department of Physics, California Institute of Technology, Pasadena, California 91125

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Optical observations provide a wealth of information on atomic abundances, the excitation (level of ionization), the kinetic temperature, and the density of the gas in H II regions. However, obscuration by dust limits optical observations of galactic H II regions to those which are nearby (within a few kpc) and which are unobscured by the molecular clouds out of which they are formed (and so generally evolved). Radio observations are unhampered by extinction but provide much more limited information. The abundance of H+, He+ and occasionally C+ can be determined as well as the kinetic temperature of the gas, but no direct information on the abundance of other species or the excitation is available.

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 96: Infrared Astronomy , 1981 , pp. 237 - 245
Copyright
Copyright © Reidel 1981 

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