Other
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987uesi....2u....s&link_type=abstract
In Universal Energy Systems, Inc., United States Air Force Graduate Student Summer Support Program, Volume 2 20 p (SEE N88-27355
Other
Astronomical Spectroscopy, Emission Spectra, M Stars, Stellar Spectra, Variable Stars, Computer Programs, Cosmic Dust, Silicates, Silicon Carbides, Spectrum Analysis, Stellar Color, Stellar Evolution
Scientific paper
A study was made of IRAS low resolution spectra (LRS) of variable M stars. The 1n class of LRS was analyzed in order to study the various types of emission features seen in these spectra. Although originally classified as featureless, it was found that approx. 30 percent of the spectra have emission features in the 9 to 15 micron region. The average excess emission above the local continuum is about 7 percent and ranges from 2 to 20 percent. Emission due to silicates at about 10 to 18 microns is seen as well as emission due to silicon carbide at 11.6 microns. A large number of objects show a broad feature between 9 and 15 microns usually centered between 11 and 12 microns. It is not clear yet whether the feature is due to carbon rich or oxygen rich dust, and may possibly be evidence for evolution from spectral type M to C. A computer program was written and modified which graphically analyzes the LRS data. Programming was implemented that allows the fitting of the local continuum using two models. The first allows the user to co-add 2 blackbody distributions, and the second employs a simple dust shell model to estimate the continuum. The color corrections is calculated by another program.
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