Spitzer IRS spectra of luminous 8 micron sources in the Large Magellanic Cloud

Show full item record

Title: Spitzer IRS spectra of luminous 8 micron sources in the Large Magellanic Cloud
Author: Buchanan, Catherine; Kastner, Joel; Forrest, William; Hrivnak, Bruce; Sahai, Raghvendra; Egan, Michael; Frank, Adam; Barnbaum, Cecilia
Abstract: 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.
Description: Also archived in: arXiv: astro-ph/0603443 v1 16 Mar 2006Published in: Proceedings of "The Spitzer Science Center 2005 Conference: Infrared Diagnostics of Galaxy Evolution", held in Pasadena, November 14-16, 2005. Edited by Ranga-Ram Chary
Record URI: http://hdl.handle.net/1850/1819
Date: 2005-11

Files in this item

Files Size Format View
JKastnerProceedings11-2005.pdf 157.4Kb PDF View/Open

The following license files are associated with this item:

This item appears in the following Collection(s)

Show full item record

Search RIT DML


Advanced Search

Browse