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| Paper: |
Mass-Loss from AGB Stars in the Local Group: Studying the Effect of Metallicity |
| Volume: |
445, Why Galaxies Care about AGB Stars II: Shining Examples and Common Inhabitants |
| Page: |
509 |
| Authors: |
Lagadec, E.; Zijsltra, A. A.; Sloan, G. C.; Mauron, N.; Matsuura, M. |
| Abstract: |
Our Spitzer survey of AGB stars in Local Group galaxies has shown
that the amount of dust ejected by carbon stars is independent of the
metallicity. But those stars are too distant to be observed in CO,
and thus to study their total (gas + dust) mass-loss rates. We have
therefore extensively studied a sample of newly-discovered metal-poor
carbon stars in the Galactic halo. CO observations, combined
with near-infrared data using Spitzer and the VLT have allowed us
to study both the dust and gas content of these stars and thus get better
quantitative constraints on the effect of metallicity on the mass-loss
process. These observations show that the expansion velocity decreases
with metallicity. |
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