Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..416w&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, June 1, 1981, p. 416-425. Research supported by the National Geographic Society and Fa
Astronomy and Astrophysics
Astronomy
120
Cosmic Dust, Far Infrared Radiation, Infrared Astronomy, Interstellar Matter, Nebulae, Thermal Radiation, C-141 Aircraft, Heating, Interstellar Extinction, Optical Thickness, Radiative Heat Transfer, Stellar Radiation, Ultraviolet Radiation
Scientific paper
Thermal emission from dust in the reflection nebula NGC 7023 has been observed at wavelengths between 40 and 400 microns. The observed far-infrared emission comes from a region approximately 4 arcmin in diameter and shows spatial structure which correlates well with the distribution of reflected visible radiation. Temperature and optical depth maps indicate that the dust which emits the far-infrared radiation is heated by UV and visual radiation from the central star (HD 200775) and that the dust density increases steeply northwest of the star. The far-infrared data are not consistent with either the spherical or uniform slab geometries used in earlier analyses of optical observations. Comparisons of the far-infrared measurements with optical and UV measurements give a value between 2000 and 5000 for the ratio of extinction efficiency in the UV to that at 125 microns. This value is compared with the results of other observational studies and with theoretical grain models.
Gatley Ian
Hildebrand Roger H.
Keene Jocelyn
Sellgren Kris
Werner Michael W.
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