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Submillimetre observations of the cold dust halo of NGC 7027

Gee, G., Emerson, J. P., Ade, Peter A. R. and Nolt, I. G. 1984. Submillimetre observations of the cold dust halo of NGC 7027. Monthly Notices of the Royal Astronomical Society 208 (3) , pp. 517-523. 10.1093/mnras/208.3.517

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We report the detection of sub millimetre radiation from the planetary nebula NGC 7027. The measured flux at 370 μm is in excess of that expected from extrapolating the free–free emission of the H II region and the dust emission seen at 100 μm. This excess is interpreted as arising in a cold (∼ 20 K) dust halo surrounding the planetary nebula. We compare the 370-μm dust optical depth with the gas column densities and optical extinction to NGC 7027. The dust grains responsible for the submillimetre halo emission are similar to those found elsewhere in the interstellar medium, both in the ratio of the visual extinction efficiency to the absorption efficiency at 370 μm and in the abundance relative to the gas. The mass of dust required to produce the 370-μm excess is consistent with the halo mass of ≳ 5M ⊙ deduced by Knapp et al. (1982). This supports their conclusion that the masses of some stars which evolve into white dwarfs rather than supernovae are at least ∼6.5M ⊙ . This is consistent with the suggestion of Weidemann & Koester (1983) that white-dwarf progenitors can have masses up to ∼8M ⊙ .

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: Wiley-Blackwell
ISSN: 0035-8711
Last Modified: 04 Jun 2017 06:37

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