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

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dc.contributor.author Buchanan, Catherine en_US
dc.contributor.author Kastner, Joel en_US
dc.contributor.author Forrest, William en_US
dc.contributor.author Hrivnak, Bruce en_US
dc.contributor.author Sahai, Raghvendra en_US
dc.contributor.author Egan, Michael en_US
dc.contributor.author Frank, Adam en_US
dc.contributor.author Barnbaum, Cecilia en_US
dc.date.accessioned 2006-05-18T18:06:00Z en_US
dc.date.available 2006-05-18T18:06:00Z en_US
dc.date.issued 2005-11 en_US
dc.identifier.citation ASP Conference Series: The Spitzer Science Center 2005 Conference: Infrared Diagnostics of Galaxy Evolution en_US
dc.identifier.uri http://hdl.handle.net/1850/1819 en_US
dc.description Also archived in: arXiv: astro-ph/0603443 v1 16 Mar 2006 en_US
dc.description Published 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 en_US
dc.description.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. en_US
dc.description.sponsorship Thanks to the conference organizers for a great meeting. 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 awards issued by JPL/Caltech. The IRS was a collaborative venture between Cornell University and Ball Aerospace Corporation funded by NASA through the Jet Propulsion Laboratory and Ames Research Center. en_US
dc.format.extent 157401 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher Astronomical Society of the Pacific en_US
dc.subject Galaxies - evolution en_US
dc.subject Galaxies - photometry en_US
dc.subject Spectrography en_US
dc.title Spitzer IRS spectra of luminous 8 micron sources in the Large Magellanic Cloud en_US
dc.type Proceedings en_US

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