Infrared spectroscopy with a balloon borne Michelson interferometer. II Observation of O III, O I, and N III fine structure lines in H II regions

Details Infrared spectroscopy with a balloon borne Michelson interferometer. II Observation of O III, O I, and N III fine structure lines in H II regions Infrared spectroscopy with a balloon borne Michelson interferometer. II Observation of O III, O I, and N III fine structure lines in H II regions

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....90..304m&link_type=abstract

Astronomy and Astrophysics, vol. 90, no. 3, Oct. 1980, p. 304-310. Research supported by the Science Research Council.

Astronomy and Astrophysics

Astrophysics

21

Balloon-Borne Instruments, H Ii Regions, Infrared Spectroscopy, Line Spectra, Michelson Interferometers, Abundance, Electron Density Profiles, Fine Structure, Ionized Gases, Oxygen

Scientific paper

Observations of the forbidden O III ionic fine structure lines at 52 and 88 microns made at a resolution of 0.05 kayser with a balloon-borne telescope and Michelson interferometer, are presented for the H II regions W 51, G 333.6-0.2, M 17 S, M 17 N, NGC 6357, and NGC 6334. This is the first time that both forbidden O III lines have been measured simultaneously. Values for the electron density deduced from the line ratios are found to agree with the radio data, while the O(+2) abundances indicate a lower excitation than expected in many cases. The forbidden O I line at 63 microns was also detected in NGC 6357. In addition, the first detection of the forbidden N III line at 57 microns which was observed from both sources in M 17 and gives the abundance ratio N/O = 0.13 is reported. This line was also marginally detected on W 51.

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