Other
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50147s&link_type=abstract
Spitzer Proposal ID #50147
Other
Scientific paper
We propose to use the Short-High module on the IRS to observe five evolved objects in the Magellanic Clouds with unusual spectral features in the 13-17 um spectral region revealed by low-resolution IRS observations. This spectral region is opaque from ground-based and airborne observatories, so the next opportunity to study these sources will come only with the launch of the next infrared space telescope. One object is in transistion from the asymptotic giant branch to a planetary nebula and shows a combination of emission from polycyclic aromatic hydrocarbons and absorption from acetylene. The spectrum also shows a broad absorption band in the 13-17 um region that has been observed in two other objects at higher resolution, where it separates into bands from a range of hydrocarbon molecules. The other four objects show an emission feature at 14 um in addition to strong silicate emission features. This feature lies at the boundary betwen the SL and LL modules, making SH observations essential to demonstrate that the 14 um features is not an artifact. The proposed observations will take 6.0 hours, and we are requesting the time as part of the IRS GTO allocation.
Bernard-Salas Jeronimo
Kraemer Kathleen E.
Sloan Greg
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