Ten-micron observations of bright circumstellar shells - Spectral properties and a search for extended emission

Details Ten-micron observations of bright circumstellar shells - Spectral properties and a search for extended emission Ten-micron observations of bright circumstellar shells - Spectral properties and a search for extended emission

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pasp..101.1140l&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 101, Dec. 1989, p. 1140-1150. Research supported by USA

Astronomy and Astrophysics

Astronomy

4

Astronomical Spectroscopy, Emission Spectra, Stellar Envelopes, Variable Stars, Abundance, Infrared Spectra, Light Curve, Silicon Carbides, Spatial Distribution, Spectral Line Width

Scientific paper

For several bright long-period variable stars, 9-14-micron spectra were obtained using novel instrumentation comprising a mosaic detector array and a prism slit spectrometer. Three of the stars are carbon rich and have SiC feature emission. The remaining five are oxygen rich; three exhibit pronounced silicate emission. Agreement in the SiC equivalent widths was found for the three carbon stars observed here and during the 1983 flight of the IRAS low-resolution spectrometer. Two stars with silicate feature emission observed at both epochs, IRC + 10420 and Mu Cep, show pronounced variation in the equivalent widths of these features. It is found that the observed upper limits on the surface brightness of dust associated with molecular outflows from IRC + 10216 are compatible with calculated lower limits, yielding no additional constraints on the depressed dust emission suggested by far-infrared detections of the outflow material.

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