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| Paper: |
GRAMS Evolved Star Mass-Loss Models: CMDs, CCDs, and Stellar
Population Analysis for the LMC |
| Volume: |
445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants |
| Page: |
457 |
| Authors: |
Sargent, B.; Srinivasan, S.; Meixner, M. |
| Abstract: |
The Surveying the Agents of a Galaxy's Evolution (SAGE)
Spitzer Space Telescope Legacy project has obtained photometry
at mid-infrared wavelengths (3.6, 4.5, 5.8, 8, and 24 microns) for
over 6 million stars in the Large Magellanic Cloud (LMC). Combined
with optical and near-infrared photometry from other catalogs, we have
assembled spectral energy distributions for >25000 evolved stars in
the LMC. To model mass loss from these stars, we developed the
GRAMS (Grid of RSG and AGB Models)
grid using the radiative transfer code 2Dust.
The grid spans the relevant ranges of parameters such as stellar
effective temperature, luminosity, and dust shell optical depth.
We compare observed and model photometry using color-magnitude and
color-color diagrams. Finally, after obtaining stellar effective
temperature, luminosity, and dust mass-loss rate for each evolved
star candidate by fitting models to data, we explore mass loss in
the context of stellar populations in the LMC. |
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