21 and 30 Micron Emission Features in Post-AGB Circumstellar Envelopes

Details 21 and 30 Micron Emission Features in Post-AGB Circumstellar Envelopes 21 and 30 Micron Emission Features in Post-AGB Circumstellar Envelopes

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20208h&link_type=abstract

Spitzer Proposal ID #20208

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Scientific paper

We propose to obtain IRS HL and HS spectra of the unidentified 21 micron feature and the recently resolved 30 (27+34) micron feature in eight carbon-rich proto-planetary nebulae. For four of these, we have previously detected the 21 micron feature but at low S/N, and in the other four, we predict its presence. ISO spectra had detector problems at 27 microns, which make the exact shape of the two 30 micron components somewhat uncertain. These observations will greatly assist in the identification of the carriers of these features and provide important insights into the circumstellar chemistry in this carbon-rich and transient environment. The spectral energy distributions will be modeled, and from these the density profiles and mass-loss rates will be determined, along with the feature shapes and strengths.

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