Astronomy and Astrophysics – Astronomy
Scientific paper
May 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220p...7r&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, May 1, 1986, p. 7P-11P.
Astronomy and Astrophysics
Astronomy
26
Emission Spectra, Infrared Spectra, Peculiar Stars, Planetary Nebulae, Stellar Envelopes, Stellar Spectra, Cosmic Dust, Spatial Distribution, Speckle Patterns
Scientific paper
Speckle observations at the peaks of narrow dust emission features at 3.3 and 3.5 microns in the low-excitation planetary nebula CPD-56 deg 8032 and the peculiar emission-line star HD 97048 are presented. In CPD-56 deg 8032 the emission in the 3.28-micron band is extended on a scale of approximately 1.3 arcsec, and this is probably the same as the extent of the ionized nebula. By contrast, the emission in the 3.53-micron band in HD 97048 is spatially unresolved and arises from a region less than 0.1 arcsec across. Dust grains within 0.05 arcsec of the star have temperatures not less than 1000 K, so that the proposed identification of the species emitting the strong 3.43-and 3.53-micron features with formaldehyde ice is untenable, and the materials responsible for the band emission remain unidentified.
Allen David A.
Bailey Jon A.
Roche Patrick F.
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