Infrared spectra of evolved stars with unusual dust shells

Details Infrared spectra of evolved stars with unusual dust shells Infrared spectra of evolved stars with unusual dust shells

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999mnras.309..180s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 309, Issue 1, pp. 180-188.

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Scientific paper

New mid-infrared spectra are presented of a number of oxygen-rich evolved stars which have IRAS LRS (Low Resolution Spectrometer) spectra that were classified as showing SiC emission. Two of the sources, IRC-20445 and IRC-20461, show the unidentified infrared (UIR) bands superposed on silicate emission features. Both objects have been classified as M supergiants. Several other sources show three-component spectra, with peaks at 10, 11 and 13μm. The 13-μm source FI Lyr shows a narrow emission feature at 19μm. Emission by oxide grains may be responsible for the 11-, 13- and 19-μm features. One object, IRC-20455, shows a self-absorbed silicate feature. There is no clear evidence for SiC emission in any of the spectra: the LRS spectra were erroneously classified as showing SiC emission because of the relatively strong 11-μm emission.

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