Infrared excess and ionized He abundance in H II regions

Details Infrared excess and ionized He abundance in H II regions Infrared excess and ionized He abundance in H II regions

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....69..129e&link_type=abstract

Astronomy and Astrophysics, vol. 69, no. 1, Sept. 1978, p. 129-134. Research supported by the Science Research Council.

Astronomy and Astrophysics

Astronomy

11

Abundance, H Ii Regions, Helium Ions, Infrared Astronomy, Ionized Gases, Far Infrared Radiation, Hydrogen Ions, Interstellar Matter, Radio Astronomy

Scientific paper

The evidence for a decrease of observed He(+)/H(+) ratio (derived from radio recombination-line measurements) with increasing infrared excess is reexamined using comparable sets of far-IR (40-350 microns) and radio data. The existence of this effect is confirmed and is considered to provide support for the suggested presence inside H II regions of dust which selectively absorbs He-ionizing photons and accounts for the low apparent values of He/H found in some H II regions. Detailed interpretation of the effect confirmed has been made by Panagia and Smith (1978), who find a ratio of dust absorption cross sections for He and H ionizing photons of 4 + or - 1 if current non-LTE model atmospheres are correct.

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