Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98..995m&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 98, Oct. 1986, p. 995-998.
Astronomy and Astrophysics
Astronomy
38
Absorption Spectra, H Ii Regions, Infrared Sources (Astronomy), Interstellar Chemistry, Interstellar Matter, Absorption Cross Sections, Cosmic Dust, Kramers-Kronig Formula
Scientific paper
The materials of which dust is composed are not known very precisely, but a general theorem in physics (the Kramers-Kronig relations) provides sufficient restraints regarding the cross section of dust in the ionizing ultraviolet. The large far-infrared luminosity of H II regions shows that dust absorbs most of the ionizing photons in them. However, models show that dust has little effect on the nebular spectrum, although of course it does tie up some heavy elements in the solid phase. For nebulae with very high excitation parameters the effect is potentially larger, but dust is strongly depleted, relative to the solar neighborhood, in such objects. Furthermore, the effects of large densities quenching the forbidden cooling lines, and thereby affecting the optical emission lines, is probably more important.
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