Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-16
Astronomy and Astrophysics
Astrophysics
4 pages, 4 figures, uses ASP style file. To appear in the proceedings of "The Spitzer Science Center 2005 Conference: Infrared
Scientific paper
We have produced an atlas of Spitzer Infrared Spectrograph (IRS) spectra of mass-losing, evolved stars in the Large Magellanic Cloud. These stars were selected to have high mass-loss rates and so contribute significantly to the return of processed materials to the ISM. Our high-quality spectra enable the determination of the chemistry of the circumstellar envelope from the mid-IR spectral features and continuum. We have classified the spectral types of the stars and show that the spectral types separate clearly in infrared color-color diagrams constructed from 2MASS data and synthetic IRAC/MIPS fluxes derived from our IRS spectra. We present diagnostics to identify and classify evolved stars in nearby galaxies with high confidence levels using Spitzer and 2MASS photometry. Comparison of the spectral classes determined using IRS data with the IR types assigned based on NIR colors also revealed a significant number of misclassifications and enabled us to refine the NIR color criteria resulting in more accurate NIR color classifications of dust-enshrouded objects.
Barnbaum Cecilia
Buchanan Catherine L.
Egan Michael
Forrest William John
Frank Adam
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