Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....35..467a&link_type=abstract
Astronomy and Astrophysics, vol. 35, no. 3, Oct. 1974, p. 467-472. In French.
Astronomy and Astrophysics
Astronomy
6
Astronomical Photography, Emission Spectra, Infrared Astronomy, Near Infrared Radiation, Nebulae, Abundance, Helium, Infrared Filters, Infrared Photography, Interstellar Gas, Luminous Intensity
Scientific paper
The central region of the Orion nebula was photographed using the 193-cm telescope at Haute Provence Observatory with an electronic infrared camera and a series of interference filters in the spectral range 7500-11,000 A. The photographs for He I 10,830 A differ from those at other wavelengths. Multichannel spectrometric and interferometric studies support the hypothesis that 10,830-A photons are absorbed by dust particles mixed with the gas in the nebula. The results suggest an increase in the dust-to-gas ratio in going from the central region to outer regions of the nebula. The picture corresponding to /S II/ (centered on 10,330 A with bandpass 200 A) shows numerous stars which are not visible on the others or the maps established by Parenago.
Andrillat Yvette
Duchesne M.
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