Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..889t&link_type=abstract
Astrophysical Journal, Part 1, vol. 235, Feb. 1, 1980, p. 889-893.
Astronomy and Astrophysics
Astronomy
35
H Lines, Helium, Infrared Astronomy, Nebulae, Stellar Evolution, Stellar Spectra, Emission Spectra, H Ii Regions, Infrared Spectra, Line Spectra, Stellar Luminosity, Stellar Models
Scientific paper
Infrared spectra at moderate resolution have been obtained of two highly luminous H II regions /W51(IRS 2) and K3-50/. The hydrogen and helium line strengths have been analyzed to determine the extinction and values of Ne(2)V associated with these sources. The positions of the objects in a Ne(2)V versus log L/solar-L plot confirm previous work that both objects are very early (O3, O2) stars in which dust has absorbed a significant amount of the ionizing flux. The relationship between the presence of the He I line at 4859/cm and the optical depth of the Lyman continuum is investigated. It is found that a high line strength implies that the nebula is ionization bounded and that limits on the line strength are imposed by the hydrogen ionization cross section.
Thompson Rodger I.
Tokunaga Alan T.
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