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Title:
The mysterious 10 micron emission feature in the spectrum of Nova Aquilae 1982
Authors:
Gehrz, R. D.; Ney, E. P.; Grasdalen, G. L.; Hackwell, J. A.; Thronson, H. A., Jr.
Affiliation:
AA(Minnesota, University, Minneapolis, MN), AB(Wyoming Infrared Observatory, Laramie, WY), AC(Wyoming Infrared Observatory, Laramie, WY)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 1, 1984, p. 303-312. Research supported by the University of Wyoming, NSF, and NASA. (ApJ Homepage)
Publication Date:
06/1984
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
COSMIC DUST, EMISSION SPECTRA, INFRARED SPECTRA, NOVAE, STELLAR ENVELOPES, STELLAR SPECTROPHOTOMETRY, BROADBAND, LINE SPECTRA, SPECTRAL RESOLUTION
DOI:
10.1086/162100
Bibliographic Code:
1984ApJ...281..303G

Abstract

Broad-band 1.2-23 micron photometry and 1 percent resolution 7-14 micron spectrophotometry of Nova Aql 1982 are presented. This nova developed similarly to other dusty novae in that the appearance of thermal infrared emission from a circumstellar dust shell was coincident with a downward transition at visual wavelengths. A strong 10 micron emission feature appeared in the spectrum of Nova Aql 1982 during the dust shell development phase. This feature was not entirely similar to emission features previously observed in other stars with circumstellar shells. The contrast of the nova's 10 micron feature was larger than those observed in the SiC-rich shells of carbon stars. On the other hand, although the nova emission feature was reminiscent of the 10 micron silicate emission feature observed in oxygen-rich supergiants, it peaked at a slightly longer wavelength and there was no corresponding 20 micron emission feature. The contrast of the feature increased with time. It is concluded that an anomalous dust grain component, tentatively identified as SiC, nucleated and grew in the circumstellar shell of Nova Aql 1982.

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