Astronomy and Astrophysics – Astronomy
Scientific paper
May 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974mmsai..45..287d&link_type=abstract
(Ministero della Pubblica Istruzione, CNR, and Universita di Trieste, European Regional Meeting in Astronomy, 2nd, Trieste, Ital
Astronomy and Astrophysics
Astronomy
1
Cosmic Dust, H Ii Regions, Nebulae, Stellar Temperature, Globular Clusters, Heavy Elements, Helium Ions, Hydrogen Ions, Light Scattering, Radiation Pressure, Recombination Reactions, Stellar Evolution, Temperature Distribution
Scientific paper
Available data on the temperature of the diffuse nebulae are appreciably higher than the temperatures obtained by theoretical calculations when solar abundances of the heavier elements are used. Another discrepancy between observation and theory is related to the ionization structure. It is suggested that the presence of dust in the nebula can explain both of these phenomena. Attention is given to helium-hydrogen profile temperatures, the depletion of heavy elements, and details concerning the ionization structure.
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