Silicate Emission at 10 Microns in Variables on the Asymptotic Giant Branch

Details Silicate Emission at 10 Microns in Variables on the Asymptotic Giant Branch Silicate Emission at 10 Microns in Variables on the Asymptotic Giant Branch

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...451..758s&link_type=abstract

Astrophysical Journal v.451, p.758

Astronomy and Astrophysics

Astronomy

61

Infrared: Stars, Stars: Agb And Post-Agb, Stars: Circumstellar Matter

Scientific paper

We show that the observed shapes of the silicate emission profile at 10 microns are described by a sequence from the classic, narrow silicate emission feature peaking at 10 microns to a broad, low-contrast feature which peaks longward of 11 microns. We use this silicate dust sequence as the basis for a new system to classify the silicate emission feature, apply it to spectra taken by the IRAS Low-Resolution Spectrometer (LRS) for a flux-limited sample of variable stars on the asymptotic giant branch (AGB), and compare our system to previous classification systems of the LRS spectra. Our results suggest that either AGB stars produce multiple shells during their evolution or that spectra from oxygen-rich dust shells do not evolve from broad to narrow emission.

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