Dust at Low Metallicity: Spitzer Observations of AGB Stars in NGC 6822

Details Dust at Low Metallicity: Spitzer Observations of AGB Stars in NGC 6822 Dust at Low Metallicity: Spitzer Observations of AGB Stars in NGC 6822

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916813v&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #168.13; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Dust condensation may depend heavily on the metallicity, although the effect is poorly known. The total condensed dust mass from stars at low metallicity could be lower, there could be more simple oxides and fewer silicates, and the degree of silicate crystallinity could be lower. We have obtained mid-infrared spectra with the Spitzer Space Telescope of a sample of 20 Cand O-rich asymptotic giant branch (AGB) stars in the Local Group dwarf galaxy NGC 6822. To our knowledge this is the first time such evolved stars have been spectroscopically observed in this galaxy. We compare our results to those for AGB stars in the Galaxy and in the Magellanic Clouds. We intend to contribute to an improved understanding of dust formation in general and to provide the ability to use grain properties and dust composition as a tool to trace physical conditions in nearby galaxies. This work is based on observations made with the Spitzer Space Telescope, which is operated by the Jet Propulsion Laboratory, California Institute of Technology under a contract with NASA. Support for this work was provided by NASA through an award issued by JPL/Caltech.

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