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| Paper: |
Metallic Iron Grains in AGB Winds |
| Volume: |
445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants |
| Page: |
241 |
| Authors: |
McDonald, I.; Zijlstra, A. A.; Sloan, G. C.; Matsuura, M. |
| Abstract: |
Iron grains, due to their lack of spectral features, play an important
but poorly-understood role in the production of dust by AGB stars.
By modelling the spectral energy distributions of such stars, one can
accurately identify the infrared excess which these grains cause.
We have analysed dust production among giant stars in several globular
clusters at different metallicities. We present new understanding of
iron’s contribution to the earliest stages of dust production around
AGB stars, and how dust species change as stars evolve. We also discuss
the production and destruction of iron-bearing silicates, the
metallicity dependance of dust production and composition, and what
dust species can tell us about the state of the stellar wind in the
dust-forming zone. |
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