Testing The Sensitivity Of Spectral Feature Parameters To Analysis Methods - "10 Micron" Features In Oh/ir Stars.

Details Testing The Sensitivity Of Spectral Feature Parameters To Analysis Methods - "10 Micron" Features In Oh/ir Stars. Testing The Sensitivity Of Spectral Feature Parameters To Analysis Methods - "10 Micron" Features In Oh/ir Stars.

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21543107r&link_type=abstract

American Astronomical Society, AAS Meeting #215, #431.07; Bulletin of the American Astronomical Society, Vol. 42, p.363

Astronomy and Astrophysics

Astronomy

Scientific paper

The 10 micron amorphous silicate feature is almost ubiquitous in space. In very evolved Oxygen-rich AGB stars this feature is seen in absorption and in some cases it is unusually broad and asymmetric. There are currently three main hypotheses to explain this broadening: (1) the addition of crystalline silicate dust; (2) the addition of amorphous alumina dust; and (3) large grain sizes. To distinguish between these hypotheses, we have selected a sample of fourteen O-rich AGB stars which show this feature and for which both ISO SWS and IRAS LRS spectra exist. To isolate the parameters of the 10 micron feature we must eliminate continuum contributions to the spectrum. However, the detailed parameters of the feature may be sensitive to the choice of continuum. To assess this sensitivity, we have fitted the continua in two ways and analyzed whether the isolated spectral features change significantly. We have determined that the precise parameters of the 10 micron feature are not sensitive to the choice of continuum, however, the same cannot be said for the entire spectrum, especially if we include the 18 micron feature. Our preliminary analysis of the 10micron feature does not distinguish between the three hypothese and thus we are now incorporating the 18 micron feature into our sudy.

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