Mass Loss from Evolved Stars in the LMC: A Spitzer SAGE View

Details Mass Loss from Evolved Stars in the LMC: A Spitzer SAGE View Mass Loss from Evolved Stars in the LMC: A Spitzer SAGE View

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20919205b&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #192.05; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

I will present preliminary results for Evolved Star properties and their mass--loss contribution to the Large Magellanic Cloud (LMC) as viewed from color--magnitude diagrams (CMDs) obtained with the Spitzer space telescope SAGE (Surveying the Agents of a Galaxy's Evolution) survey. These data represent the deepest, widest mid--infrared CMDs of their kind ever produced in the LMC. Combined with the 2MASS survey, the diagrams are used to delineate the evolved stellar populations in the LMC from which we can deduce the relative contributions to the complete mass--loss budget. I will show initial fits to the spectral energy distributions of the LMC stars using dust radiative transfer models and assumptions about the evolved star envelopes guided by existing observations of luminous stars. Owing to the high angular resolution and sensitivity of Spitzer, we can identify essentially all the important mass--loss sources in the galaxy. Indeed, there is strong evidence from the 24 micron channel of Spitzer that previously unexplored, lower luminosity oxygen--rich AGB stars contribute significantly to the mass loss budget.
This work has been funded by generous grants from the NASA SST program.

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