The Spitzer IRS Spectral Atlas of Infrared-Luminous Evolved Stars in the Large Magellanic Cloud

Details The Spitzer IRS Spectral Atlas of Infrared-Luminous Evolved Stars in the Large Magellanic Cloud The Spitzer IRS Spectral Atlas of Infrared-Luminous Evolved Stars in the Large Magellanic Cloud

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3426k&link_type=abstract

Spitzer Proposal ID #3426

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Scientific paper

Highly evolved, mass-losing stars are the most infrared-luminous, non-transient stellar objects in the universe. Mass loss from such stars drives the chemical evolution of the universe and, ultimately, determines the infrared emission signatures of other important Spitzer sources ranging from Galactic H II regions to infrared-luminous galaxies at high redshift. We propose to obtain IRS spectra of 66 of the dustiest, most luminous post-main sequence stars in the Large Magellanic Cloud (LMC). From these data we will infer the circumstellar chemistries of the LMC's most rapidly mass-losing evolved stars, i.e., the objects that likely dominate the rate of return of nuclear-processed material to the interstellar medium of the LMC. In addition to providing new insight into the chemical enrichment of the LMC and the dependence of circumstellar chemistries on the masses and evolutionary states of red giant progenitors, a key outcome of this IRS survey will be the definitive calibration of photometric indicators of envelope chemistry. Thus, our catalog of IRS spectra of the most IR-luminous mass-losing stars in the LMC will be an indispensible tool with which to intepret near-IR and Spitzer photometry of Local Group galaxies in terms of the mass-losing evolved star populations and rates of chemical enrichment of these galaxies.

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