Hi-Res Spectroscopy of New 15um Feature

Details Hi-Res Spectroscopy of New 15um Feature Hi-Res Spectroscopy of New 15um Feature

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop..278w&link_type=abstract

Spitzer Proposal ID #278

Computer Science

Scientific paper

We request 2.1 hrs of DDT for hi-resolution observations of two stars. We have discovered previously unkown emission features near 15um in IRS Lo Resolution spectra of two bright stars - the A star Iota Cen (HD115892) and the carbon star HD100764. In HD115892, the 15um feature is accompanied by an extremely unusual continuum which is almost flat from 16 to at least 70um. In HD100764 the accompanying continuum is more blackbody-like with some PAH features, but there may be additional spectral features around 25um which are too bright to be measured reliably with Long-Lo. The appearance of th 15um features is suggestive of unresolved molecular bands. The proposed high resolution observations will resolve the bands, providing additional information to aid in identification. They will help us to understand if the same material is producing this feature in these two rather different stellar environments and indicate whether the features near 25um in HD100764 are real.

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