IRAS measurements of H II regions

Details IRAS measurements of H II regions IRAS measurements of H II regions

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...173..108a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 1, Feb. 1987, p. 108-114.

Astronomy and Astrophysics

Astronomy

28

Abundance, Far Infrared Radiation, H Ii Regions, Infrared Spectra, Absorption Spectra, Infrared Astronomy Satellite, Radiant Flux Density, Spectral Resolution

Scientific paper

Far-infrared broad band (IRAS) measurements of 71 compact H II regions and IRAS Low Resolution Spectra (LRS) of some of them, are presented. Ly-alpha does not contain sufficient energy to heat the dust, and another energy source (probably direct absorption of radiation from the exciting star) is required for all the H II regions studied. The observed infrared excess is between 4 and 38. The infrared luminosities for H II regions with known distances give information concerning the spectral type of the exciting star. Neon and sulfur abundances have been estimated from IRAS Low Resolution Spectra when the amount of hydrogen can be determined (from the continuous radio emission). The range of neon and sulfur abundance is unexpectedly large. Finally, objects are discussed having an LRS spectrum similar to an H II region but lacking radio emission.

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