Spitzer Spectroscopy of Evolved Stars in the LMC

Details Spitzer Spectroscopy of Evolved Stars in the LMC Spitzer Spectroscopy of Evolved Stars in the LMC

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20919206k&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #192.06; Bulletin of the American Astronomical Society,

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Scientific paper

In the era of Spitzer, rapidly mass-losing asymptotic giant branch (AGB) and red supergiant (RSG) stars are readily detectable throughout the Local Group. Such stars dominate the rate of return of nuclear-processed material to the interstellar medium (ISM) and, hence, play crucial roles in the chemical evolution of galaxies. I describe recent results from Spitzer Infrared Spectrograph (IRS) surveys of IR-luminous AGB stars and RSGs in the Large Magellanic Cloud (LMC). These results provide new insight into the composition of the dust and gas injected into the ISM by an evolved star population in a subsolar-metallicity environment, and offer new constraints on stellar evolution theory. Spitzer IRS spectroscopy of LMC evolved stars also provides the basis on which to reliably identify and classify mass-losing evolved stars detected in SAGE and other broad-band infrared imaging surveys.
Spitzer data analysis at RIT is supported by JPL/Caltech award NMO710076.

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