Photoelectric heating of H II regions

Details Photoelectric heating of H II regions Photoelectric heating of H II regions

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...106....1m&link_type=abstract

Astronomy and Astrophysics, vol. 106, no. 1, Feb. 1982, p. 1-3. Research supported by the Conselho Nacional de Pesquisas.

Astronomy and Astrophysics

Astrophysics

18

Electron Energy, Gas Heating, H Ii Regions, Photoelectric Emission, Cosmic Dust, Helium, Hydrogen, Ionic Collisions, Photoionization

Scientific paper

It is determined through the study of H II region heating by electrons ejected from grains after absorption of stellar photons, as well as by recombination of Lyman-alpha photons, that the nebula is heated further by photoionization of H and He, and cooled by collisional excitation of low-lying, abundant ion levels. It is found that this mechanism can influence nebula thermal structure at 20-60% of the Stromgren radius, depending on assumed electron density.

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