Infrared and optical measurements of the ionized gas in K3-50

Details Infrared and optical measurements of the ionized gas in K3-50 Infrared and optical measurements of the ionized gas in K3-50

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229..981l&link_type=abstract

Astrophysical Journal, Part 1, vol. 229, May 1, 1979, p. 981-989.

Astronomy and Astrophysics

Astrophysics

19

Abundance, Electron Density (Concentration), Infrared Spectroscopy, Ionized Gases, Nebulae, Optical Emission Spectroscopy, Absorption Spectra, Cosmic Dust, Emission Spectra, H Ii Regions, Interstellar Extinction

Scientific paper

Results are reported for optical, near-IR, and mid-IR spectrophotometry of the compact H II region K3-50A. The emission-line observations imply an electron density of about 100,000 per cu cm; the consistency of density measurements in the optical, IR, and radio sources suggests that the optical counterpart of K3-50A is a reflection nebula. Previous measurements of the anomalous extinction law in K3-50A are confirmed, this law is extended out to B-alpha at 4 microns, and a 9-micron optical depth of about 2.5 is obtained. Elemental abundances are derived from measurements of emission lines of several dominant ions of the same element and found to be in close agreement (50%) with mean cosmic abundances. Individual ionic ratios are compared with model H II region calculations to determine the nature of the ionizing radiation. It is concluded that if nongray UV dust absorption does not modify the spectrum appreciably, the radiation temperature can be associated with a stellar surface temperature of about 37,000 K, corresponding to an O6 supergiant.

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