Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.9205h&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #92.05; Bulletin of the American Astronomical Society, V
Other
Scientific paper
A very broad emission feature (or features) around 30 microns has been observed in the mid-infrared spectra of carbon-rich evolved objects (AGB stars, planetary nebulae, proto-planetary nebulae (PPNe)) and has been generally attributed to MgS. A broad emission feature around 20 microns and particular to PPNe was first discovered in the IRAS LRS spectra and has subsequently been seen in a dozen carbon-rich PPNe. Its identification is uncertain although several suggestions have been published. We have used Spitzer to observe several PPNe with IRS in the high-resolution mode, resulting in the discovery of a new 21 micron source (IRAS 06530-0213) and the confirmation at much higher S/N of another 21 micron source (IRAS 05113+1347). These spectra are examined to investigate (a) if the 30 micron feature consists of two components, as has been reported, and (b) if the 21 micron features in the new sources have the same shape and central wavelength as in the half-dozen previously observed at high S/N. This research is supported in part by NASA through a grant from JPL.
Hrivnak Bruce J.
Kwok Sun
Volk Kathryn
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