Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...212..696e&link_type=abstract
Astrophysical Journal, Part 1, vol. 212, Mar. 15, 1977, p. 696-703.
Astronomy and Astrophysics
Astronomy
15
Astronomical Spectroscopy, Infrared Astronomy, Infrared Spectra, Nebulae, Absorption Cross Sections, Block Diagrams, Data Reduction, Forbidden Bands, H Ii Regions, Michelson Interferometers, Thermal Emission, Water Vapor
Scientific paper
The infrared spectrum of the Kleinmann-Low nebula in M42 has been measured from 80 to 350 kaysers (approximately 29 to 125 microns) with a Michelson interferometer aboard the NASA Kuiper Airborne Observatory. The frequency spectrum peaks at about 185 kaysers. A simple model of the emission implies that the temperature is in the range 70-95 K and that the optical depth is at least 0.2 at the peak frequency. A possible absorption is seen at about 176 kaysers. Thermal emission by dust at a temperature of 71 K, with the absorption cross section proportional to frequency, provides a good fit to the data. Other thermal-emission models can also fit the spectrum. The data are compared with previous broad-band measurements. Upper limits are placed on expected line emission from the surrounding H II region at the position of the nebula.
Augason Gordon C.
Caroff Lawrence J.
Erickson Edwin F.
Goorvitch David
Scargle Jeffrey D.
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