Effects of Dust in High-Metallicity HII Regions

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Session 82 -- HII Regions
Display presentation, Wednesday, 11, 1995, 9:20am - 6:30pm

[82.09] Effects of Dust in High-Metallicity HII Regions

J.C.Shields, R.C.Kennicutt (Steward Obs.)

Dust and associated depletion of heavy elements from the gas phase in HII regions can modify the emergent optical spectrum from that produced by a grain-free nebula. These changes result from a combination of effects including removal of gas-phase coolants, selective absorption of the ionizing continuum, and heating by grain photoelectrons. The influence of dust on the optical emission spectrum may be especially important in high-metallicity HII regions. Theoretical calculations illustrating the amplitude of these effects and their potential role in explaining some aspects of observed HII region properties will be presented.

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