Observations of the 30 micron feature in IRC + 10216

Astronomy and Astrophysics – Astronomy

Scientific paper

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Carbon Stars, Infrared Astronomy, Planetary Nebulae, Stellar Envelopes, Variable Stars, Astronomical Spectroscopy, Black Body Radiation, Emission Spectra, Stellar Evolution, Stellar Structure

Scientific paper

Infrared observations from 30 to 37 microns of IRC+10216 extend the wavelength coverage of the 30-micron feature found in four carbon stars and two planetary nebulae by Forrest, Houck, and McCarthy (1981). The present data confirm the existence of this newly observed feature and determine its shape beyond 30 microns. The determination of the long-wavelength end of the spectral excess depends critically on the assumed underlying continuum. A combined spectrum of the excess is presented and shows the feature to extend to at least 37 microns.

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